摘要：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
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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
查看习题详情和答案>>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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