Unit8 Imagine that！重点语法：原因状语从句精讲精练40题-2025-2026学年八年级英语下册重难点讲练全攻略（沪教版）

**基本信息** 以原因状语从句引导词系统对比为核心，通过分类总表、易错对比、时态配套构建方法体系，40题精准覆盖中考高频考点，提升语言运用与逻辑分析能力。 **专项设计** |模块|题量/典例|方法提炼|知识逻辑| |----|-----------|----------|----------| |引导词分类|4类引导词+例句|用法/语气/位置/时态四维对比|从核心概念（根本原因/已知原因等）到差异化应用| |重难点对比|3组易错点+正误例|because与so等连用禁忌|通过错误分析强化语法规则理解| |复合介词|2个短语+结构|because of等后接名词不接句子|从从句到介词短语的语法功能拓展| |时态配套|4种主句从句时态|主从句时态一致性规则|基于语境的时态逻辑推导| |高频句型|1个句型+例句|Now that同since表已知事实|中考固定表达的场景化应用| |精练|40题|覆盖引导词辨析/时态/易错点|以题强化方法迁移与知识综合运用|

2025-2026学年一线教师制作新教材英语同步精品系列资料，名师遴选！ 2025-2026学年一线教师制作新教材英语同步精品系列资料，名师遴选！ 学校:___________姓名：___________班级：___________考号：___________ Unit8 Imagine that！ 重点语法：原因状语从句精讲精练40题 语法知识精讲 一、引导词分类总表 引导词 核心用法 语气强弱 从句位置 时态规则 例句 because 直接说明根本原因，回答 why 提问，最常用 最强（客观直接原因） 可前可后；放句首加逗号 主从句时态按需一致，过去事由用过去时 He stayed at home because he was ill. Because it rained, we cancelled the trip. since 显而易见、双方已知的原因，译为 “既然” 中等（已知原因） 多放句首，少数后置 常用一般现在 / 过去时 Since you are tired, you can go to bed early. as 口语化，附带原因，“由于、鉴于” 偏弱（附带理由） 常置于句首 时态随语境 As the bus was late, I missed class. for 并列连词，补充推断理由，不能放句首，不答 why 最弱（推测） 只能放主句后，逗号隔开 时态和主句统一 It must have rained, for the ground is wet. 二、重难点易错对比表 考点 用法说明 易错误区 正确例句 错误写法 because 与 so 不能连用 because 连词引导从句，so 并列连词连接句子，二者二选一 同时出现 because+so Because I got up late, I missed the bus. I got up late, so I missed the bus. ×Because I got up late, so I missed the bus. since 不表 “自从” 表原因 = 既然；表自从引导时间状语从句，时态不同 混用时态、词义 Since everyone is here, let’s start. I have lived here since 2020（时间从句） ×Since he is busy, so he can’t come. for 不能放句首 for 是并列连词，仅后置表推测，不表直接原因 句首用 for The lights are off, for nobody is in the room. ×For he is sleepy, he goes home. 三、特殊结构：复合介词表原因（中考常考） 短语 中文 句式结构 例句 because of + 名词 / 代词 / 动名词 因为 后接名词短语，不加句子 He couldn’t go out because of the heavy rain. thanks to 多亏、由于（好坏结果均可） + 名词 /doing Thanks to your help, I finished work. 四、时态配套速记表 主句时态 从句常用时态 适用引导词 一般现在时 一般现在时 because/as/since（客观事实） 一般过去时 一般过去时 because/as/since（过去事件） 将来时（will/be going to） 一般现在时（原因常态） since/as 情态动词（must/may 表推测） 一般现在时 for（推测理由） 五、中考高频固定句型 句型 翻译 举例 Now that + 从句，主句 既然（已知事实，同 since） Now that you know the truth, don’t lie anymore. 语法知识精练 1．—Why should we be green? —________ it’s good for the earth. A．So B．Because C．But D．And 2．Tom practises speaking English every day ________ he wants to improve it. A．if B．because C．but D．unless 3．Let’s get started! ________ our group members are all free this Saturday, shall we have a discussion? A．Though B．While C．Since D．Unless 4．________ Zhang Xue kept on improving his motorcycles for over 20 years and never gave up, his team finally won the WSBK championship (冠军) and made history. A．Although B．Because C．If D．So 5．Amy often picks up litter in the park ________ she believes small acts can protect our shared home. A．since B．though C．until D．before 6．—Why do you keep on reading traditional culture books? —I do it ________ I want to know more about local Anhui customs. A．so that B．because C．though D．once 7．—I want to join the art club, but I’m worried about my study. —________ you love painting so much, why not try balancing both? Art can also help you relax. A．Because B．Although C．Since D．Unless 8．Keeping a reading diary is useful ________ it helps me understand the ideas better. A．because B．though C．until D．unless 9．________ more than 80% of the villagers now have access to clean tap water, the local government is planning a new recycling system. A．Unless B．Though C．Since D．Until 10．________ you have finished your homework, you can go out to relax for a while. A．Unless B．Since C．Though D．Until 11．More and more people choose green travel ________ it can reduce air pollution. A．but B．or C．until D．because 12．Celina didn’t buy the dictionary yesterday ________ her aunt would give her one. A．until B．because C．if D．before 13．We’d better get to school earlier ________ it’s our School Sports Day. A．and B．so C．though D．because 14．________ Hefei’s drone industry develops fast, it has won wide attention across China. A．Although B．Because C．While D．Unless 15．Many elderly people are very lonely ________ their families don’t visit often. A．so B．because C．but D．or 16．She was late for class ________ she didn’t catch the early bus. A．so B．because C．although D．unless 17．Lisa was late for school this morning ________ her bike broke down on the way. A．so that B．although C．because D．if 18．It’s dangerous for us to go near the sun ________ it’s too hot. A．because B．so C．but D．and 19．________ I had a headache, I didn’t go to the concert last night. A．Because of B．For C．Because D．But 20．—Why do you learn different cultural expressions? —________ it helps us communicate better with foreign friends. A．Because B．So C．But D．And 21．________ this method doesn’t work, let’s try another one. A．Since B．Unless C．However D．Although 22．________ you have finished your homework, why not go out for a walk to relax? A．Since B．Unless C．Though D．Until 23．She is the best choice for this job, ________ she has a lot of experience. A．however B．since C．while D．so 24．Many students join the kung fu club ________ they want to keep healthy. A．because B．so C．but D．before 25．Many teens are interested in traditional culture ________ they think it is meaningful. A．so B．or C．but D．because 26．He didn’t go to school yesterday ________ he had a fever. A．so B．but C．because D．or 27．— Why do you like group work? — ________ we can learn from each other. A．So B．Because C．But D．Though 28．I didn’t go to the party not ________ the weather but ________ I didn’t feel well. A．because of; because B．because; because of C．because; because D．because of; because of 29．She won’t go to the cinema ______ she has already seen the film. A．until B．if C．so D．because 30．—Why is your team so successful? —________ we pull together and communicate well. A．Because B．So C．But D．Although 31．Compared to going by bus, I’d like to walk to school in the morning ________ the fresh air makes me feel comfortable. A．if B．because C．although D．until 32．I often drink a cup of coffee in the morning __________ it helps me wake up. A．because B．so C．but D．although 33．Don’t be afraid of changing ________ it will lead you to a new beginning. A．when B．unless C．before D．because 34．Museums are becoming more popular ________ people want to learn more about culture and history. A．as B．unless C．until D．although 35．— It’s said that Yangzhou Fried Rice is very famous and delicious. — Well, ________ we’re here, why not go to the restaurant and order some? A．unless B．since C．until D．though 36．She went back to live with her mother ________ she couldn’t afford a flat for herself. A．while B．but C．since D．so 37．The word “as” in the sentence “As he likes the sounds of nature, Tan uses them a lot in his music.” is used to ________. A．show purpose B．show reason C．show result D．show time 38．—It’s widely known that xiaolongbao is a local delicacy. —Well, ________ we have been in Wuxi, it would be a shame to leave without tasting it. A．though B．unless C．since D．until 39．________ we visited the science museum last week, we learned a lot about space technology. A．If B．Because C．So D．But 40．—How was your trip? —Not good. ________ we didn’t have enough time, we had to visit some places of interest quickly. A．Until B．Since C．Before D．If 2 同步新教材，周周有练习，月月有重点！ 1 同步新教材，周周有练习，月月有重点！ 学科网（北京）股份有限公司 $ 2025-2026学年一线教师制作新教材英语同步精品系列资料，名师遴选！ 2025-2026学年一线教师制作新教材英语同步精品系列资料，名师遴选！ 学校:___________姓名：___________班级：___________考号：___________ Unit8 Imagine that！ 重点语法：原因状语从句精讲精练40题 语法知识精讲 一、引导词分类总表 引导词 核心用法 语气强弱 从句位置 时态规则 例句 because 直接说明根本原因，回答 why 提问，最常用 最强（客观直接原因） 可前可后；放句首加逗号 主从句时态按需一致，过去事由用过去时 He stayed at home because he was ill. Because it rained, we cancelled the trip. since 显而易见、双方已知的原因，译为 “既然” 中等（已知原因） 多放句首，少数后置 常用一般现在 / 过去时 Since you are tired, you can go to bed early. as 口语化，附带原因，“由于、鉴于” 偏弱（附带理由） 常置于句首 时态随语境 As the bus was late, I missed class. for 并列连词，补充推断理由，不能放句首，不答 why 最弱（推测） 只能放主句后，逗号隔开 时态和主句统一 It must have rained, for the ground is wet. 二、重难点易错对比表 考点 用法说明 易错误区 正确例句 错误写法 because 与 so 不能连用 because 连词引导从句，so 并列连词连接句子，二者二选一 同时出现 because+so Because I got up late, I missed the bus. I got up late, so I missed the bus. ×Because I got up late, so I missed the bus. since 不表 “自从” 表原因 = 既然；表自从引导时间状语从句，时态不同 混用时态、词义 Since everyone is here, let’s start. I have lived here since 2020（时间从句） ×Since he is busy, so he can’t come. for 不能放句首 for 是并列连词，仅后置表推测，不表直接原因 句首用 for The lights are off, for nobody is in the room. ×For he is sleepy, he goes home. 三、特殊结构：复合介词表原因（中考常考） 短语 中文 句式结构 例句 because of + 名词 / 代词 / 动名词 因为 后接名词短语，不加句子 He couldn’t go out because of the heavy rain. thanks to 多亏、由于（好坏结果均可） + 名词 /doing Thanks to your help, I finished work. 四、时态配套速记表 主句时态 从句常用时态 适用引导词 一般现在时 一般现在时 because/as/since（客观事实） 一般过去时 一般过去时 because/as/since（过去事件） 将来时（will/be going to） 一般现在时（原因常态） since/as 情态动词（must/may 表推测） 一般现在时 for（推测理由） 五、中考高频固定句型 句型 翻译 举例 Now that + 从句，主句 既然（已知事实，同 since） Now that you know the truth, don’t lie anymore. 语法知识精练 1．—Why should we be green? —________ it’s good for the earth. A．So B．Because C．But D．And 【答案】B 【详解】句意：——为什么我们要环保？——因为这对地球有好处。 So所以；Because因为；But但是；And和。根据问句“Why should we be green?”可知，特殊疑问词Why用于提问原因，答句应用Because来引导原因。 2．Tom practises speaking English every day ________ he wants to improve it. A．if B．because C．but D．unless 【答案】B 【详解】句意：汤姆每天练习说英语，因为他想要提高它。 if如果；because因为；but但是；unless除非。根据语境可知，后半句“他想要提高它”是前半句“每天练习说英语”的原因，前后句构成因果关系。 3．Let’s get started! ________ our group members are all free this Saturday, shall we have a discussion? A．Though B．While C．Since D．Unless 【答案】C 【详解】句意：让我们开始吧！既然我们小组成员本周六都有空，我们进行一次讨论好吗？ Though虽然；While当……时候/然而；Since既然/由于；Unless除非。根据“our group members are all free this Saturday”可知，是提出建议的原因，Since表示“既然”，符合语境。 4．________ Zhang Xue kept on improving his motorcycles for over 20 years and never gave up, his team finally won the WSBK championship (冠军) and made history. A．Although B．Because C．If D．So 【答案】B 【详解】句意：因为张雪坚持改进他的摩托车超过20年且从未放弃，他的团队最终赢得了WSBK冠军并创造了历史。   Although虽然；Because因为；If如果；So所以。根据句意可知，“坚持改进摩托车20年且从未放弃”是原因，“赢得冠军并创造历史”是结果，前后构成因果关系，前句为原因，应填Because。 5．Amy often picks up litter in the park ________ she believes small acts can protect our shared home. A．since B．though C．until D．before 【答案】A 【详解】句意：艾米经常在公园里捡垃圾，因为她相信小小的举动可以保护我们共同的家园。    since因为/自从；though虽然；until直到；before在……之前。前后为因果关系，后半句是前半句动作发生的原因，since引导原因状语从句。 6．—Why do you keep on reading traditional culture books? —I do it ________ I want to know more about local Anhui customs. A．so that B．because C．though D．once 【答案】B 【详解】句意：——你为什么坚持读传统文化书籍？——因为我想了解更多安徽本土民俗。 so that为了；because因为；though虽然；once一旦。根据答语中“I want to know more about local Anhui customs”可知，这正是坚持阅读传统文化书籍的原因，回答原因用because。 7．—I want to join the art club, but I’m worried about my study. —________ you love painting so much, why not try balancing both? Art can also help you relax. A．Because B．Although C．Since D．Unless 【答案】C 【详解】句意：——我想加入艺术俱乐部，但我担心我的学习。——既然你如此热爱绘画，为什么不尝试平衡两者呢？艺术也能帮助你放松。 Because因为；Although虽然；Since既然/因为；Unless除非。根据前句“you love painting so much”是既定事实，后句提出建议，表示“既然”热爱绘画，可以尝试平衡，应用Since引导原因状语从句，表示明显的理由，应填Since。 8．Keeping a reading diary is useful ________ it helps me understand the ideas better. A．because B．though C．until D．unless 【答案】A 【详解】句意：写阅读日记是有用的，因为它帮助我更好地理解观点。 because因为；though虽然；until直到；unless除非。根据“it helps me understand the ideas better”可知，后半句解释了写阅读日记有用的原因，用because引导原因状语从句。 9．________ more than 80% of the villagers now have access to clean tap water, the local government is planning a new recycling system. A．Unless B．Though C．Since D．Until 【答案】C 【详解】句意：既然超过80%的村民现在能用上干净的自来水，当地政府正在计划一个新的回收系统。 Unless除非；Though虽然；Since既然，因为；Until直到。根据句意可知，前半句“村民用上自来水”是后半句“政府计划新系统”的原因或背景，前后句构成因果逻辑，Since符合语境。 10．________ you have finished your homework, you can go out to relax for a while. A．Unless B．Since C．Though D．Until 【答案】B 【详解】句意：既然你已经完成了作业，你可以出去放松一会儿。 Unless除非；Since既然；Though虽然；Until直到。根据“you have finished your homework, you can go out to relax for a while.”可知，前后句是因果关系，表示“既然”完成了作业，就可以出去放松，应填Since。 11．More and more people choose green travel ________ it can reduce air pollution. A．but B．or C．until D．because 【答案】D 【详解】句意：越来越多的人选择绿色出行，因为它可以减少空气污染。 but但是；or或者；until直到；because因为。根据“it can reduce air pollution”可知，减少空气污染是选择绿色出行的原因，前后句是因果关系，应用because引导原因状语从句。 12．Celina didn’t buy the dictionary yesterday ________ her aunt would give her one. A．until B．because C．if D．before 【答案】B 【详解】句意：Celina昨天没有买那本字典，因为她姑姑将给她一本。 until直到……为止；because因为；if如果；before在……之前。“her aunt would give her one”是“Celina didn’t buy the dictionary yesterday”的原因，because后接原因，引导原因状语从句。 13．We’d better get to school earlier ________ it’s our School Sports Day. A．and B．so C．though D．because 【答案】D 【详解】句意：我们最好早点到学校，因为今天是我们的学校运动会。 and和，并且；so所以；though虽然；because因为。根据“We’d better get to school earlier”和“it’s our School Sports Day”可知，后者是前者早点到校的原因，应使用because引导原因状语从句。 14．________ Hefei’s drone industry develops fast, it has won wide attention across China. A．Although B．Because C．While D．Unless 【答案】B 【详解】句意：因为合肥的无人机产业发展迅速，它在全国范围内赢得了广泛关注。 Although虽然；Because因为；While然而/当……时；Unless除非。根据题干“develops fast”与“has won wide attention”可知，发展快是赢得关注的原因，应用Because引导原因状语从句，应填Because。 15．Many elderly people are very lonely ________ their families don’t visit often. A．so B．because C．but D．or 【答案】B 【详解】句意：许多老年人非常孤独，因为他们的家人不常来看望。 so所以，表示结果；because因为，表示原因；but但是，表示转折；or或者，表示选择。空格后“their families don’t visit often”是前文“many elderly people are very lonely”的原因，应填because。 16．She was late for class ________ she didn’t catch the early bus. A．so B．because C．although D．unless 【答案】B 【详解】句意：她上课迟到了，因为她没赶上早班车。 so所以；because因为；although虽然；unless除非。前半句“上课迟到”是结果，后半句“没赶上早班车”是原因，前后构成因果关系，应用because引导原因状语从句。 17．Lisa was late for school this morning ________ her bike broke down on the way. A．so that B．although C．because D．if 【答案】C 【详解】句意：丽莎今天早上上学迟到了，因为她的自行车在路上坏了。 so that以至于；although虽然；because因为；if如果。分析句子逻辑，前半句“迟到”是结果，后半句“自行车坏了”是原因。根据因果关系逻辑，此处应填表示“因为”的连词。 18．It’s dangerous for us to go near the sun ________ it’s too hot. A．because B．so C．but D．and 【答案】A 【详解】句意：靠近太阳对我们来说是危险的，因为它太热了。 because因为；so所以；but但是；and和。根据句意可知，后半句“它太热了”是前半句“危险”的原因，前后构成因果关系，应用because引导原因状语从句。 19．________ I had a headache, I didn’t go to the concert last night. A．Because of B．For C．Because D．But 【答案】C 【详解】句意：因为我头痛，所以昨晚我没去音乐会。 Because of因为（后接名词、代词或名词短语）；For因为；Because因为（后接句子）；But但是。根据空格后“I had a headache”是完整句子，且前后句为因果关系，应用Because引导原因状语从句，for为并列连词，用于连接两个并列分句，一般不用作句首。故选C。 20．—Why do you learn different cultural expressions? —________ it helps us communicate better with foreign friends. A．Because B．So C．But D．And 【答案】A 【详解】句意：——你为什么学习不同的文化表达方式？——因为它帮助我们更好地与外国朋友交流。 Because因为；So所以；But但是；And和。根据问句中的特殊疑问词“Why”可知，答语应说明原因，应使用Because引导。 21．________ this method doesn’t work, let’s try another one. A．Since B．Unless C．However D．Although 【答案】A 【详解】句意：既然这个方法不行，我们试试另一个吧。 Since既然、因为；Unless除非；However然而；Although尽管。根据句意可知，前后句是因果关系，“这个方法不行”是后句“我们试试另一个”的原因，因此选择表示原因的连词Since。 22．________ you have finished your homework, why not go out for a walk to relax? A．Since B．Unless C．Though D．Until 【答案】A 【详解】句意：既然你已经完成了你的作业，为什么不出去散步放松一下呢？ Since既然；Unless除非；Though尽管；Until直到……为止。根据“you have finished your homework, why not go out for a walk to relax?”可知，此处表示“既然”完成了作业，就可以出去散步放松，应填Since。 23．She is the best choice for this job, ________ she has a lot of experience. A．however B．since C．while D．so 【答案】B 【详解】句意：她是这份工作的最佳人选，因为她有很多经验。 however然而；since因为；while当……时/然而；so所以。根据句意可知，后半句“她有很多经验”是前半句“她是最佳人选”的原因，since引导原因状语从句，符合逻辑。 24．Many students join the kung fu club ________ they want to keep healthy. A．because B．so C．but D．before 【答案】A 【详解】句意：许多学生加入功夫俱乐部，因为他们想要保持健康。 because因为；so所以；but但是；before在……之前。“they want to keep healthy”是加入俱乐部的原因，前后句为因果关系，且空后表原因，应用because引导原因状语从句。 25．Many teens are interested in traditional culture ________ they think it is meaningful. A．so B．or C．but D．because 【答案】D 【详解】句意：许多青少年对传统文化感兴趣，因为他们认为它是有意义的。 so所以；or或者；but但是；because因为。根据前后句逻辑关系可知，后句“they think it is meaningful”是前句“Many teens are interested in traditional culture”的原因，应用表示原因的连词because。 26．He didn’t go to school yesterday ________ he had a fever. A．so B．but C．because D．or 【答案】C 【详解】句意：他昨天没去上学，因为他发烧了。 so所以；but但是；because因为；or或者。根据“he had a fever”可知，发烧是没去上学的原因，用because引导原因状语从句。 27．— Why do you like group work? — ________ we can learn from each other. A．So B．Because C．But D．Though 【答案】B 【详解】句意：—— 你为什么喜欢小组合作？—— 因为我们可以互相学习。 So所以；Because因为；But但是；Though虽然。根据问句“Why”可知是询问原因，答语应用Because来回答。 28．I didn’t go to the party not ________ the weather but ________ I didn’t feel well. A．because of; because B．because; because of C．because; because D．because of; because of 【答案】A 【详解】 句意：我没去派对不是因为天气，而是因为我不舒服。 because of因为，后接名词/代词/动名词；because因为，后接句子。第一空后是“”the weather”（名词短语），用because of；第二空后是“I didn’t feel well”（句子），用because。 29．She won’t go to the cinema ______ she has already seen the film. A．until B．if C．so D．because 【答案】D 【详解】句意：她不会去看电影，因为她已经看过这部电影了。 until直到；if如果；so因此；because因为。根据“She won’t go to the cinema... she has already seen the film.”，空前“她不会去看电影”，空后“她已经看过这部电影了”，前面是结果，后面是原因，应填because。 30．—Why is your team so successful? —________ we pull together and communicate well. A．Because B．So C．But D．Although 【答案】A 【详解】句意：——为什么你的团队如此成功？——因为我们齐心协力并且沟通良好。 Because因为，引导原因状语从句，常用于回答why引导的问句；So所以，表示结果；But但是，表示转折关系；Although虽然，引导让步状语从句。根据问句中的“Why”可知，此处需回答团队成功的原因，应选用Because表示“因为”。 31．Compared to going by bus, I’d like to walk to school in the morning ________ the fresh air makes me feel comfortable. A．if B．because C．although D．until 【答案】B 【详解】句意：与乘公交车相比，我更喜欢早上步行去学校，因为新鲜空气让我感觉舒适。 if如果；because因为；although虽然；until直到。根据“the fresh air makes me feel comfortable”可知，新鲜空气让人舒适是喜欢步行的原因，前后句构成因果关系，应填because。 32．I often drink a cup of coffee in the morning __________ it helps me wake up. A．because B．so C．but D．although 【答案】A 【详解】句意：我经常在早上喝一杯咖啡，因为它能帮助我清醒。 because因为；so所以；but但是；although虽然。根据句意可知，后半句“it helps me wake up”是前半句“drink a cup of coffee”的原因，前后句构成因果关系，故用表示原因的连词because。 33．Don’t be afraid of changing ________ it will lead you to a new beginning. A．when B．unless C．before D．because 【答案】D 【详解】句意：不要害怕改变，因为它会带你走向新的开始。 when当……时；unless除非；before在……之前；because因为。根据“Don’t be afraid of changing”（不要害怕改变）和“it will lead you to a new beginning”（它会带你走向新的开始）可知，后者是前者的原因，应用because引导原因状语从句。 34．Museums are becoming more popular ________ people want to learn more about culture and history. A．as B．unless C．until D．although 【答案】A 【详解】句意：博物馆越来越受欢迎，因为人们想了解更多的文化和历史。 as因为；unless除非；until直到；although尽管。根据“Museums are becoming more popular”和“people want to learn more about culture and history”可知，前后句为因果关系，应填as。 35．— It’s said that Yangzhou Fried Rice is very famous and delicious. — Well, ________ we’re here, why not go to the restaurant and order some? A．unless B．since C．until D．though 【答案】B 【详解】句意：——据说扬州炒饭非常有名且美味。——嗯，既然我们在这儿，为什么不去餐厅点一些呢？ unless除非；since既然；until直到；though尽管。根据“we’re here, why not go to the restaurant and order some?”可知，后半句是基于前半句“我们在这儿”这一事实提出的建议，前后构成因果关系，应用since引导原因状语从句。 36．She went back to live with her mother ________ she couldn’t afford a flat for herself. A．while B．but C．since D．so 【答案】C 【详解】句意：她回去和母亲一起住，因为她自己负担不起一套公寓。 while当……时/然而；but但是；since因为；so所以。根据“She went back to live with her mother ... she couldn’t afford a flat for herself”可知，空后内容是前文“回去和母亲住”的原因，需要表示“因为”的连词，应填since。 37．The word “as” in the sentence “As he likes the sounds of nature, Tan uses them a lot in his music.” is used to ________. A．show purpose B．show reason C．show result D．show time 【答案】B 【详解】句意：“As”在句子“因为他喜欢大自然的声音，所以谭先生经常在他的音乐中使用它们。”中用于表示原因。 show purpose表示目的；show reason表示原因；show result表示结果；show time表示时间。根据句意可知，前半句“他喜欢大自然的声音”是后半句“谭先生经常在他的音乐中使用它们”的原因，as在此处引导原因状语从句，表示原因，符合show reason的描述。 38．—It’s widely known that xiaolongbao is a local delicacy. —Well, ________ we have been in Wuxi, it would be a shame to leave without tasting it. A．though B．unless C．since D．until 【答案】C 【详解】句意：——众所周知，小笼包是当地美食。——嗯，既然我们已经在无锡了，如果不尝尝就离开会很遗憾。 though虽然；unless除非；since既然；until直到。根据“it would be a shame to leave without tasting it”可知，说话人认为应该尝尝小笼包，原因是“we have been in Wuxi”，前后是因果关系，用since表原因。 39．________ we visited the science museum last week, we learned a lot about space technology. A．If B．Because C．So D．But 【答案】B 【详解】句意：上周我们参观了科学博物馆，我们学到了很多关于太空技术的知识。 If如果；Because因为；So所以；But但是。根据前后句的逻辑关系可知，因为参观了博物馆，所以学到了很多，表示原因，应填Because。 40．—How was your trip? —Not good. ________ we didn’t have enough time, we had to visit some places of interest quickly. A．Until B．Since C．Before D．If 【答案】B 【详解】句意：——你的旅行怎么样？——不好。因为我们时间不够，我们不得不快速参观了一些名胜古迹。   Until直到；Since因为/自从；Before在……之前；If如果。根据“we didn’t have enough time”和“had to visit quickly”可知，前后为因果关系，需用Since引导原因状语从句，应填Since。 10 同步新教材，周周有练习，月月有重点！ 11 同步新教材，周周有练习，月月有重点！ 学科网（北京）股份有限公司 $