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    It’s not easy for trailwalkers to finish walking a trail within 48 hours. A. 100-kilometre B. 100-kilometres C. 100 kilometres D. 100 kilometres’ 【查看更多】

     

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    It’s not easy for trailwalkers to finish walking a ________ trail within 48 hours．

    [　　]

    A．100-kilometre

    B．100-kilometres

    C．100 kilometres

    D．100 kilometres’

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