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    28．The air is so that the smoke is rising straight up. A．calm B．silent C．still D．quiet 【查看更多】

     

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    The air is so that the smoke is rising straight up.

    A．calm    B．silent     C．still     D．quiet

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    The air is so ________ that the smoke is rising straight up．

    [　　]

    A．calm

    B．silent

    C．still

    D．quiet

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