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?