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You are sure to fail the test _________ you spend more time doing something helpful.

A.because B.but
C.when D.unless

D

解析试题分析:除非你多花些时间做一些有用的事情,否则你一定会考试失败。A. because“因为”;B. but“但是”;C. when“当……时候”;D. unless“除非”。结合句意,故选D。
考点:考查连词辨析。

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