i will help you if i _______ A.am able B.will be able C.can be able to D.am able to
问题描述:
i will help you if i _______ A.am able B.will be able C.can be able to D.am able to
答
D. am able to .
这是个省略句,相当于 I will help you if I am able to help you. 由于 help you 前面已经出现过了,所以在这里可以省略.但是,to一定不能省.另外, be able to 能够做.,固定搭配.