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

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问题 Carbon dioxide______from burning fuels is the most common of the so-called greenhouse gases.

选项 A、producing
B、having been produced
C、to be produced
D、produced

答案D

解析从燃烧的燃料所中产生的二氧化碳是所谓的二氧化碳温室气体中最常见的。过去分词produced表被动，故选D。

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