英検1級長文空所補充6問の解き方｜独自5長文30問・全120選択肢の解説【無料】

結論：英検1級の長文語句空所補充は、空欄直前の単語だけを見て語感で選ぶと失点します。重要なのは前後の関係が逆接・原因と結果・条件・具体例・言い換えのどれなのかを見分けることです。英検協会の現行形式では長文語句空所補充は6問。慶英会では独自長文5篇×各6問＝合計30問を用意し、全120選択肢を根拠と比較できる無料教材を公開しました。

正式な英検1級の内容は英検協会｜1級の試験内容をご確認ください。以下の英文・設問・正解は慶英会の独自制作であり、協会の過去問を転載・改変したものではありません。単に正解を暗記するよりも「なぜ他の3つではないか」を説明する練習に使ってください。

6問の空所補充で使う5つの判断基準

論理関係	目印となる表現	確認すること
逆接	however / nevertheless / although / yet	先に述べた事実と後の結論に対立があるか
原因・結果	therefore / consequently / as a result	どちらが原因でどちらが結果か
条件・例外	provided that / unless / even if	条件が成立するか、不成立の場合か
置換・対比	rather than / instead / not X but Y	採用することと避けることの関係
付加・説明	for example / in fact / at the same time	具体例、言い換え、同時に考慮する条件か

解き方：①空欄の前後1〜2文を読む。②予想する論理関係を日本語で一言説明。③選択肢の文法構造と前後の関係を照合。④当てはまりそうな2択が残れば、主張の強さ・時制・限定語・主語を比較する。

慶英会独自の長文5篇｜合計30問

長文1｜Public Libraries and Meaningful Access

学習テーマ：行政・公共サービス｜活動量と成果。空欄(1)〜(6)は以下の独自4択から選んでください。

A fictional city extended the opening hours of five public libraries after residents requested greater access to study spaces. The number of hours offered rose considerably. (1), visitor numbers did not increase in every neighborhood. Some libraries were difficult to reach by public transport, and families with young children still struggled to use the evening sessions. The council had changed one feature of the service without necessarily removing the barriers affecting every group.

An administrator argued that the extra hours themselves proved the programme was successful. Other officials proposed examining whether residents could actually complete useful activities. They wanted to understand changes in borrowing, quiet-study access and assistance with applications, (2) rely solely on the number of hours advertised. They also suggested a mobile library service in more remote areas. Such a service might improve access (3) staff could provide the materials and practical support residents needed.

A pilot branch then introduced short guidance sessions explaining online library resources. The sessions were free and attracted considerable early interest. (4), the participants did not represent every group the city hoped to reach. The council therefore asked how residents who did not use smartphones or speak the main local language obtained information. It invited feedback through several methods.

Officials acknowledged that the programme required funding. Extra opening hours, transport connections and different communication channels were not interchangeable solutions. Each addressed a particular barrier. The council decided to review real usage across different districts before expanding the scheme. (5), it would avoid presenting one favorable citywide average as evidence that all residents had benefited. The broader lesson was that an increase in service provision mattered (6) it produced meaningful access rather than more impressive administrative totals.

長文1の独自4択6問

Q1　空欄(1)：

• (A) However
• (B) Furthermore
• (C) Consequently
• (D) For example

Q2　空欄(2)：

• (A) as well as
• (B) rather than
• (C) because of
• (D) unless

Q3　空欄(3)：

• (A) although
• (B) instead
• (C) provided that
• (D) on the contrary

Q4　空欄(4)：

• (A) Similarly
• (B) Therefore
• (C) In other words
• (D) Nevertheless

Q5　空欄(5)：

• (A) In contrast
• (B) For this reason
• (C) For example
• (D) Even though

Q6　空欄(6)：

• (A) only if
• (B) even though
• (C) as if
• (D) regardless of whether

長文2｜Air-Quality Research and Causal Claims

学習テーマ：科学・環境｜相関と因果。空欄(1)〜(6)は以下の独自4択から選んでください。

Researchers in a fictional region installed new air-quality sensors after residents raised concerns about pollution near a transport route. The initial readings showed lower particulate concentrations than those recorded in an earlier period. Some officials attributed the improvement entirely to recently introduced cleaner buses. (1) the new vehicles may have contributed, the study had not isolated their effect from changing weather and industrial activity. The researchers warned that observing one event before another did not automatically establish a complete causal explanation.

The monitoring locations also varied. Several instruments had been installed near busy roads, while others collected information in residential areas. The team noted that the figures could serve different purposes. (2), directly comparing two locations without checking their environments could produce misleading interpretations. A measurement made near one junction could not be assumed to represent every household in the region.

The scientists proposed a second observation period using more consistent methods. The regional authority agreed to support the project (3) an independent committee approved the sampling plan. The approval would be a prerequisite for funding but would not guarantee that every scientific question would be resolved. Data analysis might still reveal uncertainty.

Several businesses asked whether the project would delay planned transport investment. The scientists replied that monitoring could help explain conditions without replacing policy decisions. (4), officials should interpret the observations with information about traffic, weather and sources outside the district. An improved average could be encouraging; (5), it would not prove that all residents experienced identical exposure. The research team hoped its next report would clarify what the evidence actually established and, (6), identify what remained uncertain.

長文2の独自4択6問

Q7　空欄(1)：

• (A) Although
• (B) As a result
• (C) Unless
• (D) In addition

Q8　空欄(2)：

• (A) In contrast
• (B) Therefore
• (C) For instance
• (D) Even if

Q9　空欄(3)：

• (A) whereas
• (B) by contrast
• (C) provided that
• (D) regardless of

Q10　空欄(4)：

• (A) Nevertheless
• (B) For example
• (C) In spite of
• (D) Accordingly

Q11　空欄(5)：

• (A) however
• (B) therefore
• (C) likewise
• (D) in fact

Q12　空欄(6)：

• (A) as a consequence
• (B) at the same time
• (C) in place of
• (D) only if

長文3｜Digital Payments and Financial Inclusion

学習テーマ：金融｜利用可能性と実際の成果。空欄(1)〜(6)は以下の独自4択から選んでください。

A fictional rural district promoted mobile payments by helping merchants open new accounts. Within three months, many shops displayed signs indicating that they accepted digital transactions. Administrators were pleased with the registration figures. (1), interviews revealed that some traders rarely used their accounts because connections were unreliable and transaction fees were difficult to understand. New accounts had increased formal access without demonstrating the same increase in active use.

One proposal would provide short training sessions on fees, security and account recovery. Business groups welcomed clearer information. Training could improve users’ confidence; (2), it could not repair a poorly performing network. The district therefore considered technical upgrades along with education.

Another official suggested requiring every merchant to use a single provider, arguing that it would simplify support. Several traders warned that a provider outage could affect many users simultaneously. Their concern was not that one platform could never be convenient, (3) that a single point of dependence might introduce an additional risk. Officials also recognized that some customers still needed non-digital options.

The council chose to monitor not just account registrations but actual transactions, reliability, costs and the ability to correct errors. The programme would be expanded (4) the trial demonstrated appropriate safeguards and practical benefits. Even after formal approval, later reviews would remain useful. A policy could be attractive on paper (5) still leave some households unable to participate. Financial inclusion, the council concluded, should be measured through meaningful opportunities (6) the appearance of universal access.

長文3の独自4択6問

Q13　空欄(1)：

• (A) Therefore
• (B) However
• (C) For instance
• (D) Similarly

Q14　空欄(2)：

• (A) as a result
• (B) for example
• (C) nevertheless
• (D) indeed

Q15　空欄(3)：

• (A) but rather
• (B) although
• (C) in order to
• (D) even if

Q16　空欄(4)：

• (A) even though
• (B) so that
• (C) regardless of whether
• (D) provided that

Q17　空欄(5)：

• (A) or
• (B) yet
• (C) because
• (D) unless

Q18　空欄(6)：

• (A) rather than
• (B) in addition to
• (C) due to
• (D) in case

長文4｜Pollination, Farming and Evidence

学習テーマ：農業・生物多様性｜量と種類。空欄(1)〜(6)は以下の独自4択から選んでください。

Pollination supports the reproduction of many flowering plants and contributes to agricultural production. Public reports sometimes state that a large proportion of major crop types depend at least partly on animal pollination. This does not mean that the same proportion of food by total volume is produced by bees. (1), the two figures use different denominators and describe different relationships. Precise language is essential when a statistic is used to support environmental policy.

In a fictional valley, orchard owners considered adding more managed honeybee hives after observing uneven yields. Some believed that additional hives would automatically solve the problem. Agricultural specialists advised examining flowering conditions, nearby habitat and the presence of other pollinators (2) drawing that conclusion. They explained that managed and wild pollinators could play complementary roles.

A community organization proposed planting strips of locally suitable flowers. This might provide resources for insects; (3), it would use land and require maintenance. Officials wanted the project to be feasible for smaller farms as well as larger operations. The council therefore considered targeted support and consultation rather than a universal rule.

A local administrator suggested evaluating the programme by counting the number of new hives and seedlings distributed. Researchers replied that those counts describe activities, (4) not whether pollination services or agricultural outcomes had improved. Future evaluation would combine evidence about pollinator visits, local conditions and production across several seasons. (5) results improved after the project began, researchers would still examine the influence of weather and other farming inputs. The aim was to reach defensible conclusions about actual effects, (6) celebrate a simple number.

長文4の独自4択6問

Q19　空欄(1)：

• (A) Consequently
• (B) In fact
• (C) Nevertheless
• (D) Unless

Q20　空欄(2)：

• (A) as soon as
• (B) rather than
• (C) before
• (D) in spite of

Q21　空欄(3)：

• (A) therefore
• (B) instead
• (C) similarly
• (D) however

Q22　空欄(4)：

• (A) but
• (B) and
• (C) therefore
• (D) unless

Q23　空欄(5)：

• (A) Because
• (B) Even if
• (C) In order that
• (D) As a result

Q24　空欄(6)：

• (A) although
• (B) so that
• (C) rather than
• (D) provided

長文5｜Urban Heat and Practical Protection

学習テーマ：公衆衛生・都市｜警報と行動。空欄(1)〜(6)は以下の独自4択から選んでください。

During an unusually hot summer, a fictional city created a website explaining heat risks and where residents could find cooling spaces. Meteorologists produced accurate forecasts, and the website attracted thousands of visitors. Officials announced that the programme had been successful. Community groups questioned that conclusion. (1) the alerts reached many people, some residents were still unable to use the suggested facilities because of transportation or mobility barriers.

Planners proposed opening more cooling rooms in public buildings. The rooms could help certain residents (2) they were reasonably accessible and had suitable hours. A new room far from the neighborhoods facing the greatest risk might be less useful than expected. At the same time, the council discussed longer-term shading and building improvements. Newly planted trees could offer future benefits; (3), they would not immediately provide the protection of mature canopy.

Public-health officials argued that forecasting and physical measures should be evaluated together. Health providers needed preparation for increased demand, and residents required understandable guidance. Counting web visits or the number of open rooms would describe administrative activities (4) demonstrate actual protection.

Budget concerns led the city to compare different options. Some residents could cool their homes, whereas others struggled with cost or housing limitations. The council agreed to use a phased approach, (5) support for people facing the greatest barriers. It would also review what had happened after each heat season. The aim was not to guarantee that extreme heat would become harmless, (6) reduce avoidable exposure through practical and equitable action.

長文5の独自4択6問

Q25　空欄(1)：

• (A) Although
• (B) As a result
• (C) Unless
• (D) In contrast

Q26　空欄(2)：

• (A) as if
• (B) provided that
• (C) even though
• (D) regardless of

Q27　空欄(3)：

• (A) therefore
• (B) for instance
• (C) however
• (D) likewise

Q28　空欄(4)：

• (A) in addition to
• (B) because of
• (C) as long as
• (D) rather than

Q29　空欄(5)：

• (A) in particular
• (B) however
• (C) otherwise
• (D) nevertheless

Q30　空欄(6)：

• (A) in contrast
• (B) but rather to
• (C) due to
• (D) for example

独自30問・全解答と誤答3択の違い

長文1｜Public Libraries and Meaningful Access

Q1 正解（A）However。開館時間は増えたが利用者増ではないので逆接。Furthermoreは単純追加、Consequentlyは因果を逆方向にし、For exampleは具体例導入にならない。

Q2 正解（B）rather than。実際の利用状況を見るので rather than rely solely on…。他の語は後続の動詞原形との意味・構造が不自然。

Q3 正解（C）provided that。スタッフが必要な支援を提供できれば改善し得る条件。althoughは対立、insteadは置換、on the contraryは反論。

Q4 正解（D）Nevertheless。初期関心は高かったが代表性は不足という逆接。Similarly/Therefore/In other wordsは論理的につながらない。

Q5 正解（B）For this reason。地区差の検証を決めたので、平均値への過剰な一般化を避けるという結果。

Q6 正解（A）only if。重要なのは実際にアクセスへ結びつく場合という必要条件。even though等では結論が反転する。

長文2｜Air-Quality Research and Causal Claims

Q7 正解（A）Although。新型車が寄与した可能性を認めても因果は未確定。譲歩Although。

Q8 正解（B）Therefore。測定地点の条件が異なるという前提から直接比較に注意という結果。

Q9 正解（C）provided that。独立委員会の承認を条件として資金援助。

Q10 正解（D）Accordingly。科学者が条件つきの解釈を求めた結果として、公式は他の要素と併せて読むべき。

Q11 正解（A）however。平均改善はよいが同じ曝露ではない逆接。

Q12 正解（B）at the same time。確立事項に加えて不明点も識別するという並列の目的。

長文3｜Digital Payments and Financial Inclusion

Q13 正解（B）However。登録増の好結果と実利用不十分という逆接。

Q14 正解（C）nevertheless。研修は有益でも通信網そのものを直さない逆接。

Q15 正解（A）but rather。not that X, but rather that Yの対比構文。

Q16 正解（D）provided that。trialの条件を満たした場合に拡大という条件。

Q17 正解（B）yet。紙上の魅力と実アクセスの不足を対比する yet。

Q18 正解（A）rather than。見た目の利用可能性ではなく実機会を指標にする。

長文4｜Pollination, Farming and Evidence

Q19 正解（B）In fact。直前の統計の誤解を説明し直し、分母の違いを明示。

Q20 正解（C）before。結論を出す前に条件を調べる before。

Q21 正解（D）however。便益と費用・土地負担の逆接。

Q22 正解（A）but。活動量であり成果ではないという対比。

Q23 正解（B）Even if。改善が起きたと仮定しても他要因の検証は必要。

Q24 正解（C）rather than。単純な数値を祝うのでなく正当な推論を目指す。

長文5｜Urban Heat and Practical Protection

Q25 正解（A）Although。警報は多数に届いたが使えない人がいるという譲歩。

Q26 正解（B）provided that。実際に利用できる場所・開館時間という条件。

Q27 正解（C）however。将来の効果と即時効果の違いで逆接。

Q28 正解（D）rather than。活動指標であって実際の保護の実証ではない。

Q29 正解（A）in particular。phaseの中で特に支援を強調。

Q30 正解（B）but rather to。not to X, but rather to Yという目的の対比。

間違えた問題の復習｜論理関係ごとに分類する

• 逆接が苦手：however / nevertheless / although / while が反対の内容を結ぶか確かめる。
• 原因・結果が苦手：therefore / accordingly を選ぶ前に原因と結論を図式化。
• 条件が苦手：unless / provided that の条件が成立する場合と不成立の場合を分ける。
• 選択肢の文法が苦手：前置詞の後ろに動詞原形を置けないなど構造も点検する。
• 主張の強さが苦手：may / might / some を always / all / must に読み替えていないか確認。

7日間の復習と初見再測定

• 1日目：5つの論理関係と典型表現を確認し、長文1の6問を解く。
• 2日目：長文2の6問で相関・因果と条件を分ける。
• 3日目：長文3の6問で実利用と登録数、条件の関係を整理。
• 4日目：長文4の6問で分母・定義・妥当な因果を確認。
• 5日目：長文5の6問で逆接と実行可能性を確認。
• 6日目：全30問のうち誤答した問題を根拠つきで再解答。
• 7日目：公式の別回の長文空所補充へ移り、同じ論理で説明する。

よくある質問

英検1級の長文語句空所補充は何問ありますか？

協会の現行案内では6問です。この記事の30問は、異なる題材で5回分の独自練習を積むための教材です。

howeverとneverthelessはいつでも入れ替えできますか？

両方とも逆接を表せますが、前後の文脈や文体・強調に応じて使い方が異なります。直前直後の論理と文法を確認してください。

語彙の意味が分かるのに空所補充で失点するのはなぜですか？

語の辞書的な意味だけでは、段落内の逆接・因果・条件・比較といった関係を判定できないことがあるためです。

この記事の長文は実際の2026年第2回の問題ですか？

いいえ。すべて慶英会の架空の学習用問題です。2026年度第2回の公式問題冊子は協会サイトにリンクしています。

公式情報・慶英会の関連教材

• 英検協会｜英検1級の試験内容
• 英検協会｜過去問と音源
• 2026年第2回・過去問と公式解答＋慶英会32問
• only if・unless・even ifの必要条件と例外40問
• 長文空所補充の段落論理・独自英文2篇
• 英検1級総合教材ガイド

慶英会の無料体験と学習相談

長文の語彙は理解できても空所補充が不安定な場合は、前後の論理を自分の言葉で説明しながら解く練習が有効です。最大1か月無料体験・学習相談はこちら。独自5長文30問・全解答は登録不要です。

慶英会の英検1級・関連無料教材：2026年第2回公式過去問・音源＋独自32問 ／ only if・unless・even ifの40問 ／ 割合・母数・増減率の40問。英検1級総合教材ガイドからも実戦教材を選べます。無料体験・学習相談もご利用ください。

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