Now I regret those weight-loss pills. A. tookB. takingC. takenD. to take

问题补充：

Now I regret those weight-loss pills.

A. took

B. taking

C. taken

D. to take

答案：

A. took

(答案→)B. taking

C. taken

D. to take

解析：考查动名词做宾语：句意：现在我后悔吃这些减肥药。Regret doing“后悔做过…”，regret to do“后悔去做…”，选B。