We often help the old man() ? A.to do some cleaning B.cleaned C.cleans D.cleaning
问题描述:
We often help the old man() ? A.to do some cleaning B.cleaned C.cleans D.cleaning
答
A help sb to do sth
答
help sb (to) do sth
A符合,BCD都不是动词原形不符合题意.
应选A