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We can’t do well in examination _________ we study hard in school time.

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

D

解析试题分析:根据题干,本句的意思是“除非我们在校努力学习,否则我们不能在考试中取得好的成绩。”unless是“除非,如果…不”的意思。其他词if“如果”,and“和”,since“自从”都不符合题意。所以本题选D。
考点:本题考查连词。

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