题目内容

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

A. taking?????????? B. taken??????????? C. being taken??????? D. having been taken

 

【答案】

B

【解析】

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。

考点：考查状语从句的省略

 

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