题目内容
You should study harder______ it is too late to catch up.
A.if | B.when | C.after | D.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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