题目内容
9．You must read the instructions carefully_________ you take the medicine．（ ）| A． | as | B． | after | C． | while | D． | before |
分析 在你服药之前必须认真阅读说明书．
解答 答案：D．
结合语境you take the medicine可以推断这句话表达的意思是"在你服药之前必须认真阅读说明书．"，所以设空处的介词表达的意思是"在…以前"，应该用before，故选D
点评 本题考查时间介词的用法．熟记时间介词的用法，掌握每一个时间介词后跟的时间类型及每个时态常用时间状语，是做题的关键．
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