Generally speaking, according to the directions, the drug has no side effect. A.

Generally speaking, ______ according to the directions, the drug has no side effect.

   A. when taking    B. when taken         C. when to take      D. when to be taken

试题答案

B

解析:

考查省略。当主句与从句主语一致时，且从句中含有be动词，这是可省略从句主语和be动词，补充完整则为“when it is taken”。