private cars are bringing us convenience, they may also cause traffic accidents and pollut

发布时间：2020-08-16 20:29:37

     private cars are bringing us convenience, they may also cause traffic accidents and pollution.
A. When
B. Since
C. while
D. As

网友回答

A. When
B. Since
(答案→)C. while
D. As
解析：句意:尽管私人车辆给我们带来了方便，然而他们也可能引起了交通事故和污染。while虽然，尽管。所以选C。
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