Why not for help when you were in trouble?A. you askB. askC. askingD. to ask

问题补充：

Why not for help when you were in trouble?

A. you ask

B. ask

C. asking

D. to ask

答案：

A. you ask

B. ask

(答案→)C. asking

D. to ask

解析：句意：当你处于困境之中时，为什么不请求帮助？why not do sth提建议，故选B。