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We can’t do well in examination _________ we study hard in school time.
A.ifB.andC.sinceD.unless
D

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。
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