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    精英家教网 > 高中英语 > 题目详情

    A large number of birds ________ to these lakes．

    [　　]
    A．

    have been returned back

    B．

    have returned back

    C．

    have returned

    D．

    have been returned

    答案：C
    解析：

    a number of表示“多”，谓语动词用复数，return本身含有back意义，当return用作及物动词时意思是“归还某物”，用作不及物动词指“回到某地”。


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