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题库 / Prep2007E2-SC-90
Diesel engines burn as much as 30 percent less fuel than gasoline engines of comparable size, as well as emitting far less carbon dioxide gas and far fewer of the other gases that have been implicated in global warming.
of comparable size, as well as emitting far less carbon dioxide gas and far fewer of the other gases that have
of comparable size, as well as emit far less carbon dioxide gas and far fewer of the other gases having
of comparable size, and also they emit far fewer carbon dioxide and other gases that have
that have a comparable size, and also they emit far less carbon dioxide gas and other gases that have
that have a comparable size, as well as emitting far fewer carbon dioxide and other gases having
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2.having done (without a comma) 永远不对，因为完成时态表示一个永久的状态，而Ving表示一个暂时的状态，二者矛盾
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