题目内容

Only ________ according to the directions can the medicine be quite effective.
A．takingB．taken
C．being takenD．having been taken
B
选项动词的逻辑主语the medicine与动词take之间为被动关系，实际上相当于一个时间状语从句only when it is taken...结构，故应选taken在句中用作状语。
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