【題目】Look! The students _____ the classroom.

A. cleanB. are cleaningC. cleaning

【答案】B

【解析】

句意:看!這些學(xué)生們在打掃教室。clean打掃,動詞原形;are cleaning現(xiàn)在進(jìn)行時(shí);cleaning現(xiàn)在分詞。根據(jù)句中look可知表達(dá)的是正在進(jìn)行的動作,故用現(xiàn)在進(jìn)行時(shí)be+doing,主語the students復(fù)數(shù),故are,故答案是B。

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