——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去時的被動態(tài)，其結(jié)構(gòu)主語+was/were+動詞過去分詞，根據(jù)中的yesterday，可推知。
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