有关比较句的一道疑难题

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10. Because natural gas is composed mostly of methane, a simple hydrocarbon, vehicles powered by natural gas emit less of certain pollutants than the burning of gasoline or diesel fuel.     D--àE
(A) less of certain pollutants than the burning of gasoline or diesel fuel
(B) fewer of certain pollutants than burning gasoline or diesel fuel do
(C) less of certain pollutants than gasoline or diesel fuel
(D) fewer of certain pollutants than does burning gasoline or diesel fuel
(E) less of certain pollutants than those burning gasoline or diesel fuel
正确答案是E，请大家给些建议，谢谢~

寂寞的自由

D选项为什么不正确呢？？谢谢大家

ecsniffer

比较对象的不一致
应该是vehicles powered by natural gas 和those burning gasoline or diesel fuel

2love2live

以下是引用ecsniffer在2004-2-6 0:42:00的发言：
比较对象的不一致
应该是vehicles powered by natural gas 和those burning gasoline or diesel fuel

同意