______ 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. 【江苏省苏州市吴中区东山中学2010-2011学年度高三第二学期模拟卷】【连词】