_____privatecarsarebringingusconvenience,theymayalsocausemoretrafficac

发布时间：2020-08-13 15:59:59

_____ private cars are bringing us convenience, they may also cause more traffic accidents and pollutionA.WhileB.AsC.IfD.Since

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A解析while表示对比，意思接近whereas“当……却……”。
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