Diesel engines burn as much as 30 percent less fuel thangasoline engines of comparable size, as well as emitting far less carbondioxide gas and far fewer of the other gases that have been implicated inglobal warming.
(A) of comparable size, as well as emitting far less carbondioxide gas and far fewer of the other gases that have (B) of comparable size, as well as emit far less carbondioxide gas and far fewer of the other gases having (C) of comparable size, and also they emit far fewer carbondioxide and other gases that have (D) that have a comparable size, and also they emit far lesscarbon dioxide gas and other gases that have (E) that have a comparable size, as well as emitting farfewer carbon dioxide and other gases having
我理解 having been done 与 have done 作限定性后置定语比错. 排除B,E 我理解less后只能接可数名词单数和不可数名词,few后只能接可数名词, 排除C,D (并且 and 与 also同时出现语义重复) 所以只剩下A 虽然答案也是A,但我不爽在as well as emitting 与哪位平行并列(我假设as well as是并列连词).