Only when___________ according to the directions can the medici
题型：不详难度：来源：
Only when___________ according to the directions can the medicine be quite effective.| A．taking | B．taken | C．being taken | D．having been taken |
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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。 |
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