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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