Why not your teacher for help when you can’t finish it by yourself?A. ask; writeB. to ask

问题补充：

Why not your teacher for help when you can’t finish it by yourself?

A. ask; write

B. to ask; writing

C. ask; writing

D. asking; write

答案：

A. ask; write

B. to ask; writing

(答案→)C. ask; writing

D. asking; write

解析：why not后接动词原形表示为什么不做某事，finish doing sth是结束（目前）正在做的事finish to do sth是结束目前所做的事情，去做其他的事。选C,当你自己不能完成它时，为什么不向老师请求帮助呢？