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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 完整的说法应是when the drug is taken according to the directions,…。由于主句的主语和从句的主语相同,且从句中的谓语动词含有be的某种形式,因此可以省略从句的主语the drug和is。
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