Only according to the directions can the medicine be quite effective.A．taking B．takenC．being taken D．having been taken 题目和参考答案——青夏教育精英家教网—

题目内容

Only ________ according to the directions can the medicine be quite effective.

A．taking B．taken

C．being taken D．having been taken

【解析】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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