摘要：25．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．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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