Generally speaking_______acording to the
instructions，the drug has no side effect.
A．when takingB．when takenC．when to takeD．when to be taken
B
B 完整的說法應(yīng)是when the drug is taken according to the directions，…。由于主句的主語和從句的主語相同，且從句中的謂語動(dòng)詞含有be的某種形式，因此可以省略從句的主語the drug和is。
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