题目内容

【题目】Generally speaking, _____ according to the directions, the drug has no side effect.

A. when taking B. when taken

C. when to take D. when to be taken

【答案】B

【解析】

试题分析:考查非谓语动词。由选项可知都有when,可以断定when 连接从句。A. taking,现在分词常做伴随状语,表主动; B. taken, 过去分词表被动,常做定语;C. to take,不定式表目的,通常做目的状语;D. to be taken,不定式的被动形式。句意:通常来说,当按照说明服用,药是没有副作用的。when 引导的句子主语与主句主语不一致,故从句要用非谓语,而the drug与take 之间是被动的关系,故用take的过去分词形式。故选B。

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