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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 clean
    C．isn’t cleanedD．wasn’t cleaned
    D

    试题分析：句意：教室为什么这么脏？——抱歉，老师。昨天没有打扫，我们忘记做了。结合语境可知下文描述的是过去的状态，故用一般过去时态，主语是动作对象，故用被动语态。选D。
    点评：英语中的时态主要是借助于时间状语与上下文语境来进行判断。解答此类题型，首先要注意句子中的时间状语，如果没有则要通过分析上下文，结合语境来判断句子的时态。语态的判断主要是确定句子主语与谓语动词的关系。如果是主动关系则用主动语态，反之如果是动宾关系，则用被动语态。
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