问题补充:
Look! David is helping his mother the room.
A. is cleaning
B. cleaning
C. cleans
D. clean
答案:
A. is cleaning
B. cleaning
C. cleans
(答案→)D. clean
解析:句意:看!戴维正在帮助他的妈妈整理房间。help sb (to)do sth帮助某人做某事,故选D
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