问题
When he is free, he often helps his parents ________ some housework.
A:does
B:do
C:doing
D:did
B:do
C:doing
D:did
正确答案是：
同类题型
When they heard the ___________ news，they got very ___________．
To enjoy the view on the way, Mary would rather spend long hours on the traintravel by air.
We usually have a rest Sunday morning. [ ]
Tom, your books should be in right order.—OK. I’ll ______ right now.
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