【題目】The students ______ the classroom, so it's tidy and clean now.
A.Clean
B.have cleaned
C.will clean
D.cleans

【答案】B
【解析】句意:學(xué)生們已經(jīng)打掃了教室,因此現(xiàn)在是整潔和干凈的。根據(jù)語境可知用現(xiàn)在完成時,其結(jié)構(gòu)是have/has done的形式。主語是復(fù)數(shù),這里用助動詞have。根據(jù)題意,故選B。

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