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—May I go swimming this afternoon?
— I'm afraid not _______ you have finished your homework.

A.ifB.unless C.becauseD.but

B

解析试题分析:句意:今天下午我可以去游泳吗?如果你没有完成作业恐怕不行。A. if如果 B. unless如果不C. because因为D. but但是,根据句意,故选B。
考点:考查连词的用法。

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