Generally speaking,______according to directions,the drug has no side-effect.

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Generally speaking,______according to directions,the drug has no side-effect.

A. when taking

B. when taken

C. when to take

D. when to be taken

参考答案:

B[解析] 主从句主语应一致,原句应为“…when it i8 taken according to…”这里it is被省略,简化为“when taken'’分词短语作状语。