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

Question

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

Answer 1

正确答案：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。