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（山东省济南市孙集中学等校2017年春季初三英语结业水平考试）—What were you doing when we were playing basketball yesterday aftern...
题目内容：
（山东省济南市孙集中学等校2017年春季初三英语结业水平考试）—What were you doing when we were playing basketball yesterday afternoon?
—I ______________ the classroom.
A. was cleaning B. have cleaned C. will clean D. clean
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