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        1. ——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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