选哪个,请给出原因.A.when taking B.when taken C.when to taken D.when to be takenGenerally speaking,_______according to the directions,the drug has no side effect.
问题描述：
选哪个,请给出原因.A.when taking B.when taken C.when to taken D.when to be taken
Generally speaking,_______according to the directions,the drug has no side effect.
答
B
一般来说,如果按照说明服药,这药没有副作用.
这句话等于：
Generally speaking,when it is taken according to.
主语是the drug,“服药”是“药被吃”,所以应该用被动语态.排除A.在状语从句中如果从句主语与主句主语一致,从句中又有be动词,主语和be动词可以被省略掉.就是B的形式.
C的形式就不对.
在这里服药说的是一般的情况,而不是安排好或即将要做的事,排除D.