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【题目】_______we make an effort to prepare carefully, we may fail the coming exam.

A.WhenB.IfC.SinceD.Unless

【答案】D

【解析】

句意:除非我们努力认真准备,否则我们可能会考试不及格。

考查连词辨析。When当……的时候;If如果;Since自从;Unless除非。根据____we make an effort to prepare carefully, we may fail the coming exam.可知前句是后句的条件,而且是否定的条件,所以用unless引导,unless相当于if not,故答案选D

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