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    精英家教网 > 初中英语 > 题目详情
    ——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过去时的被动态，其结构主语+was/were+动词过去分词，根据中的yesterday，可推知。
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