---Who cleaned the classroom?
---Mary ________.
A．canB．doesC．didD．is
C
此題考查過(guò)去時(shí)的簡(jiǎn)略回答，因其謂語(yǔ)動(dòng)詞是行為動(dòng)詞故其簡(jiǎn)略回答要用did。
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