——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
根據(jù)句意，本題應用被動語態(tài)，即“教室被打掃”，而時間是yesterday，故用一般過去時的被動語態(tài)，選D。
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