◎ 题干
— What were you doing when we were playing basketball yesterday afternoon?
— I ______ the classroom.
A.was cleaningB.have cleaned
C.will cleanD.clean
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“— What were you doing when we were playing basketball yesterday afternoon?— I ______ the classroom.A.was cleaningB.have cleaned C.will cleanD.clean…”主要考查了你对  【一般现在时】【过去进行时】【过去完成进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。