Generally speaking, according to the directions, the drug has no side effect.A. when take

发布时间：2020-08-16 05:53:01

Generally speaking, according to the directions,      the drug has no side effect.
A. when taken
B. when taking
C. when to take
D. when to be taken

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(答案→)A. when taken
B. when taking
C. when to take
D. when to be taken
解析：在句中作时间状语，省略句，此处为被动，用过去分词。
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