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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.

B


解析:

本题考查非谓语动词的用法。题意为:一般来说,如果按照说明服这药的话,它不会有副作用。连词when后常接分词做状语,从逻辑上看,take与drug之间明显是被动关系,因此要用过去分词。此处when taken 相当与when it is taken. C项是现在分词的被动式,表示正在进行之意,与题意不符。D项是不定式的被动式,常用做目的状语或定语,在此亦不正确。故答案为B.\

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