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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
当分词的逻辑主语也就是主句的主语,这时可以省去逻辑主语和be动词.现在分词表示主动和进行,而过去分词表示被动和完成。在这个句子中,其实是when the drug is taken,省去了the drug is,the drug 和take是被动关系.
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