问题
选择题
When he is free, he often helps his parents ________ some housework.
A．does
B．do
C．doing
D．did
答案
答案：B
题目分析：句意：当他有空时，他经常帮助他的父母做家务。help sb （to）do sth意为“帮助某人做某事”，其中可以省略to；故选B。
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When he is free, he often helps his parents ________ some housework.
A．does
B．do
C．doing
D．did
答案：B
题目分析：句意：当他有空时，他经常帮助他的父母做家务。help sb （to）do sth意为“帮助某人做某事”，其中可以省略to；故选B。