题目内容

——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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