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(dāng)分詞的邏輯主語也就是主句的主語，這時(shí)可以省去邏輯主語和be動(dòng)詞.現(xiàn)在分詞表示主動(dòng)和進(jìn)行，而過去分詞表示被動(dòng)和完成。在這個(gè)句子中，其實(shí)是when the drug is taken,省去了the drug is，the drug 和take是被動(dòng)關(guān)系．
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