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Generally speaking, ______according to the directions, the drug has no side effect.

A.when takingB.when takenC.when to takeD.when to be taken

B

解析试题分析:考查状语从句的省略。全句意思是:一般来说,药品在根据说明书服用时是没有副作用的。动词不定式一般不作时间状语,故先排除C、D两项。分词作状语,表示主动关系时用现在分词,表示被动关系时用过去分词。根据句意,应用B项,when taken="when" the drug is taken。
考点:考查状语从句的省略

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