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    Is oxygen the only gas helps fire burn A. that B. / C. which D. what 【查看更多】

     

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     Is oxygen the only gas ______ helps fire burn?
    A that        B /   C which     D what

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    Is oxygen the only gas ________ helps fire burn?

    [    ]

    A. that 　　B. / 　　C. which 　　D. what

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    Is oxygen the only gas ________  helps fire burn?

    [　　]

    A．that
    B．/
    C．which
    D．what

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    Is oxygen the only gas ________ helps fire burn?

    [　　]
    A．

    that

    B．

    /

    C．

    which

    D．

    what

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