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    He became an ice-skating champion when he was . A. twelve-years-old B. twelve years old C. twelve years D. twelve-year-old 【查看更多】

     

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    He became an ice skating champion when he was ________.

    [　　]

    A．twelve years
    B．twelve-year-old
    C．twelve-years-old
    D．twelve years old

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