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______ private cars are bringing us convenience, they also cause more traffic accidents and pollution.

       A. While          B. As         C. If     D. Since

_____ private cars are bringing us convenience, they also cause more traffic accidents and pollution.

　 A. While　　 B. As　　 　C. If　　 D. Since

_____ private cars are bringing us convenience, they may also cause more traffic accidents and pollution. 【江蘇省蘇州市吳中區東山中學2010-2011學年度高三第二學期模擬卷】【連詞】