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    A large number of birds to these lakes. A. have been returned back B. have returned back C. have returned D. have been returned [解析] a number of表示数量.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.用作不及物动词指回到 答案:C 【查看更多】

     

    题目列表(包括答案和解析)

    A large number of birds ________ to these lakes．

    [　　]
    A．

    have been returned back

    B．

    have returned back

    C．

    have returned

    D．

    have been returned

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