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【題目】Look! The students _____ the classroom.

A. cleanB. are cleaningC. cleaning

【答案】B

【解析】

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

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