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【题目】Studying in groups is necessary ______you want to do well in school.
A.if
B.until
C.unless
D.though

【答案】A
【解析】由前半句的“小组学习是必要的”以及后半句“你想在学校做得出色”推知后半句是前半句动作发生的条件,故选if,if引导条件状语从句。unless与句意不符,故不能选。

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