Look! The students _____ the classroom.

A．cleanB．a(chǎn)re cleaning
C．a(chǎn)re cleanD．cleaning

B

解析試題分析：句意：看！這些學(xué)生們正在打掃教室。分析：考查現(xiàn)在進行時的用法，構(gòu)成：be doing,主語是第三人稱復(fù)數(shù)，因此be 動詞用are.故選 B
考點：考查動詞的用法。

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