| 1. 难度：简单 | |
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(2018上海改编)Peter spent half a day fishing by the river, ________ he didn't catch anything.
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| 2. 难度：简单 | |
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(2018泰州改编)Give him more time，________ he will find the answer to the question on his own.
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| 3. 难度：简单 | |
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(2018张家口三模)My clock didn't go off this morning，________ I didn't arrive at school on time.
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| 4. 难度：简单 | |
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(2018保定莲池区二模)We all know that Mike is not an officer, ________ a common soldier.
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| 5. 难度：中等 | |
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(2018承德二模)The story mainly tells us that i________ we work hard, we won't fall behind.
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| 6. 难度：中等 | |
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(2019原创)My mom always cooks chicken soup for me b________ it's good for my health.
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| 7. 难度：中等 | |
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(2019原创)I'm sorry. I forgot to take out the rubbish w________ I left home in the morning.
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| 8. 难度：中等 | |
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(2019原创)T________ he is only seven years old, he knows a lot about science.
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| 9. 难度：中等 | |
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(2019原创)Everyone should wait in line outside. You couldn't come in u________ your name is called.
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| 10. 难度：中等 | |
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(2018扬州)Hawking is no longer with us, ________ he will continue to inspire the world. A.so B.if C.but D.as
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| 11. 难度：中等 | |
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(2018沈阳)My grandparents wrote letters to keep in touch with others ________ they were young. A.when B.since C.after D.before
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| 12. 难度：中等 | |
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(2018云南)We don't know the love of our parents ________ we become parents ourselves one day. A.until B.after C.when D.since
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| 13. 难度：中等 | |
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(2018石家庄一模)We should give the boy another chance ________ he has made a mistake. A.though B.when C.unless D.because
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| 14. 难度：中等 | |
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(2018张家口桥西区一模)It was dark at that time, ________ I couldn't see what had happened. A.and B.but C.or D.so
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| 15. 难度：中等 | |
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(2018秦皇岛二模) My mother has taught in this school ________ our family moved to this city. A.for B.until C.because D.since
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| 16. 难度：中等 | |
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(2018邯郸二模)You must treat your school work seriously ________ you want to go to the key senior high school. A.unless B.if C.though D.because
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| 17. 难度：中等 | |
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(2019原创)All students were doing their DIY work ________ the teacher came in. A.when B.since C.before D.after
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| 18. 难度：简单 | |
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(2019原创)I'd like to go with you, ________ I have many other things to do. A.and B.but C.or D.so
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| 19. 难度：简单 | |
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(2019原创)________ summer ends and autumn comes, the days get shorter and shorter. A.If B.As C.Though D.Before
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| 20. 难度：简单 | |
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(2019原创)Find ways to get on well with your classmates, ________ you will get yourself very lonely. A.but B.so C.and D.or
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| 21. 难度：中等 | |
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(2019原创)Jenny didn't go to bed ________ her mother came home last night. A.though B.if C.while D.until
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| 22. 难度：中等 | |
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(2019原创)________Jack didn't win the match, he was still wearing a smile on his face. A.Once B.Although C.Because D.Unless
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| 23. 难度：中等 | |
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(2019原创)A true friend can see the pain in your eyes ________ everyone else believes the smile on your face. A.while B.until C.before D.because
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| 24. 难度：中等 | |
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(2019原创)I am really proud of my group ________ we're always discussing and sharing study methods together. A.because B.though C.unless D.if
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| 25. 难度：中等 | |
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(2019原创)Our teacher asked us to finish our reports in two hours, ________ Mark finished his just in an hour. A.or B.and C.so D.but
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