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    9．Flight BA123 to Vienna is now boarding at . A. Gate 21 B. 21st Gate C. the Gate 21 D. 21 Gate 【查看更多】

     

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    Flight BA123 to Vienna is now boarding at ________.

    [　　]

    A．Gate 21
    B．21st Gate
    C．the Gate 21
    D．21 Gate

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