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    精英家教网 > 高中英语 > 题目详情
    Only when­­­­­­­­­­­­­­­­­___________ according to the directions can the medicine be quite effective.
    A．takingB．takenC．being takenD．having been taken
    B

    试题分析：句意：只有当按照说明被服用这个药才能非常有效。这里用了状语从句的省略，完整的是only when the medicine is taken according to the directions can…，当主从句的主语一致的时候，可以省略从句的主语和be动词，所以选B。
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