We often help the old man() ? A.to do some cleaning B.cleaned C.cleans D.cleaning

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We often help the old man() ? A.to do some cleaning B.cleaned C.cleans D.cleaning
We often help the old man() ? A.to do some cleaning B.cleaned C.cleans D.cleaning

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

A help sb to do sth