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——Why is the classroom so dirty?
——Sorry, Sir. It _____ yesterday. We forgot to do it.
A.doesn’t cleanB.didn’t cleanC.isn’t cleanedD.wasn’t cleaned
D
根据句意,本题应用被动语态,即“教室被打扫”,而时间是yesterday,故用一般过去时的被动语态,选D。
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