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You should study harder______ it is too late to catch up.

A.ifB.whenC.afterD.before

D

解析试题分析:if是否,如果;when当……时;after在……之后;before在……之前,以免。句意:你应该努力学习,不然太晚了,就来不及了。故选D。
考点:考查连词。

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