1.Why not ____Professor Li for help?He is kind-hearted and willing to help.
A.ask B you ask C. to ask D. your asking
答案是A why not后面不是应该跟doing嘛?
2.turn down 和 turn away都有拒绝的意思,怎么辨别
3.The teacher has his students____a composition evey other week.
A.to write B.written C.writing D.write
答案是D 不是have sb done嘛?