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(diǎn)評(píng)：現(xiàn)在進(jìn)行時(shí)表示動(dòng)作正在進(jìn)行，由be + doing構(gòu)成，be為助動(dòng)詞。初學(xué)者最容易漏掉，它應(yīng)與主語(yǔ)的人稱(chēng)和數(shù)保持一致。習(xí)慣于look（看），listen（聽(tīng)）等表動(dòng)作的動(dòng)詞連用。
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