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

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

[　　]

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

33. 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

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