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Carbon dioxide__________from burning fuels is the most common of the so-called greenhousegases.
A.producing
B.having been produced
C.to be produced
D.produced
B.having been produced
C.to be produced
D.produced
参考答案
参考解析
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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