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
當分詞的邏輯主語也就是主句的主語，這時可以省去邏輯主語和be動詞.現(xiàn)在分詞表示主動和進行，而過去分詞表示被動和完成。在這個句子中，其實是when the drug is taken,省去了the drug is，the drug 和take是被動關(guān)系．
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