Look! David is helping his mother the room.A. is cleaningB. cleaning C. cleans D. clean

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