——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
本句子考察的是一般過(guò)去時(shí)的被動(dòng)態(tài)，其結(jié)構(gòu)主語(yǔ)+was/were+動(dòng)詞過(guò)去分詞，根據(jù)中的yesterday，可推知。
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