I often see you _____ the old man do the housework
问题描述:
I often see you _____ the old man do the housework
A,to help.B.helps.C.help.D.helping
答
C
see sb do sth 指动作已结束.
see sb doing sth 指动词正在进行
根据句子意思,是动作已结束,故C对.