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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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It is an idiomatic usage that when we use a verb after 'as well as', we always use and verb+ing form. Emitting is a gerund here because as well as is preposition rather than conjunction in this context and a preposition is always followed by a noun of an action noun 'gerund'. A question of parallelism arises only when a coordinate conjunction is involved and not with a prepositional phrase.
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