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    Thirty-seven years not long in the history of mankind. A. are B. is C. were D. was 【查看更多】

     

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    Thirty-seven years ________ not long in the history of mankind .

    [　　]

    A．are
    B．is
    C．has been
    D．have been

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    Thirty-seven years ________ not long in the history of mankind .

    [　　]

    A．are
    B．is
    C．has been
    D．have been

    查看答案和解析>>


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