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You are sure to fail the exam _________ you study hard.

A. if B. unless C. since D. That

B

【解析】

试题分析:句意为:除非你努力学习,否则你肯定考试不及格。if:如果,表示假设; unless:除非,表示让步;since:自从……以来,表示时间;that:常做宾语或定于从句的引导词。根据语境可知应选B。

考点:考查连词用法辨析。

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