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

試題分析：句意：看！戴維正在幫助他的媽媽整理房間。help sb (to)do sth幫助某人做某事，故選D
點評：現(xiàn)在進行時表示動作正在進行，由be + doing構(gòu)成，be為助動詞。初學者最容易漏掉，它應與主語的人稱和數(shù)保持一致。習慣于look（看），listen（聽）等表動作的動詞連用。
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