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【题目】Learning to write is learning to think. You don't know things clearly____you can write them down.
A. unless B. if C. since D. whether
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【题目】Be careful! Don’t break __________.
A.somethingB.nothingC.anythingD.everything
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【题目】You will fall behind others you work hard.
A. if B. unless C. though D. since
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【题目】Jim is always so busy he has little time for his family.
A. if B. until C. that D. which
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【题目】 Helen didn't know anything about it her father told her.
A. if B. because C. after D. until
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【题目】 Could you help me with housework _____________ you are free today?
A. since B. though C. unless D. until
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【题目】I think you should complain, , of course, you are happy with the situation.
A. unless B. however C. until D. though
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