Carbon dioxide(CO2) from burning fuels is the most common of the so-called greenhouse gas

发布时间：2020-08-17 04:13:46

Carbon dioxide(CO2)     from burning fuels is the most mon of the so-called greenhouse gases.
A. producing
B. having been produced
C. to be produced
D. produced

网友回答

A. producing
B. having been produced
C. to be produced
(答案→)D. produced
解析：句意：由于燃烧燃料而产生了的二氧化碳是最常见的被称为温室效应气体。整个句子的谓语动词是is，所以空格处是非谓语动词，carbon dioxide与produce之间是被动关系，故用过去分词，这里不强调produce发生的动作的时间的先后，故选D。
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