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    • It is time sb did.老师为什么要强调did

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    推荐答案   2010-07-30
    因为这个句型含有早该去做而没有做，为时已晚的意思，所以这个做也是过去发生的，用did
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    其他回答
    第1个回答  2010-07-30
    因为这个要记住的 不能用别的时态语态
    第2个回答  2010-07-30
    时态啊。
    第3个回答  2010-07-30
    这是虚拟语气的一种:
    It's time +从句 (从句要用过去时或should+动词原形)
    第4个回答  2010-07-30
    it's (high)time sb did/should(不可省) do 经常做..
    固定句型..
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