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    精英家教网 > 高中英语 > 题目详情
    -----They used to be good friends, but now they are like strangers. ----- How _____ this ______?
    A．were; come aboutB．did; come about
    C．were; taken placeD．were; happened
    B
     come about, take place, happen都是发生的意思，均无被动语态。
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