on time this medicine will be quite effective.A. TakingB. Being takenC. TakenD. Having t

问题补充：

on time, this medicine will be quite effective.

A. Taking

B. Being taken

C. Taken

D. Having taken

答案：

A. Taking

B. Being taken

(答案→)C. Taken

D. Having taken

解析：this medicine 与动词take 为被动关系，故用过去分词。