标题: [求助] 什么时候可以用having been ... 修饰 [打印本页] 作者: lee200n 时间: 2016-8-1 19:56 标题: [求助] 什么时候可以用having been ... 修饰 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.