问题补充:
Do you often help your mother?
A. with clean the house
B. cleaning the house
C. to cleaning the house
D. clean the house
答案:
A. with clean the house
B. cleaning the house
C. to cleaning the house
(答案→)D. clean the house
解析:句意:你经常帮妈妈打扫房子吗?固定短语help sb to do sth./do sth.或者help sb. with sth. 故选D.