Carbon dioxide from burning fuels is the most common of the so-called greenhouse gases.A.

问题补充：

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

答案：

A. producing

B. having been produced

C. to be produced

(答案→)D. produced

解析：此题为非谓语动词的考查,因为carbon dioxide 与produce 之间是动宾关系,所以 用过去分词表示被动。故选D。