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Generally speaking, when _____ according to the directions, the medicine has no side effect.
A.takenB.takingC.to takeD.to be taken
A

试题分析:考查状语从句的省略:句意:“通常说来,当被按照说明书服用时,这个要没有副作用。”应为这句话的主语是drug,所以应该是“被服用”,所以是when +过去分词。省略了the medicine is,选A。
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