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    45． -Thanks for helping me with this difficult maths problem. - . That’s what a close friend should do. A．Nothing serious. B．All right C．Never mind D．Forget it. 【查看更多】

     

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    －Thanks for helping me with this difficult maths problem．

    －________．That’s what a close friend should do．

    [　　]

    A．Nothing serious

    B．All right

    C．Never mind

    D．Forget it

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