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    28．Carbon dioxide from burning fuels is the most common of the greenhouse gases． A．producing B．having been produced C．produced D．to be produced 【查看更多】

     

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    Carbon dioxide ______ from burning fuels is the most common of the greenhouse gases．

    A．producing                         B．having been produced

    C．produced                                    D．to be produced

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    Carbon dioxide     from burning fuels is the most common of the so-called greenhouse gases.

          A．produced          B．producing         C．to be produced    D．having been produced

     

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    Carbon dioxide ___ from burning fuels is the most common of the so-called greenhouse gases.

    A．producing

    B．having been produced

    C．to be produced

    D．produced

     

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    Carbon dioxide ________ from burning fuels is the most common of the so?called greenhouse gases.

    A．producing

    B．having been produced

    C．to be produced

    D．produced

     

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    Carbon dioxide      from burning fuels is the most common of the so – called greenhouse gases．

           A．producing        B．having been produced    

           C．to be produced        D．produced

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