【題目】—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

【答案】A

【解析】本題考查動(dòng)詞時(shí)態(tài)。結(jié)合語境可知，此處要用過去進(jìn)行時(shí)，表示過去某段時(shí)間正在進(jìn)行的動(dòng)作。

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