Private cars really provide much convenience to people, and they cause too many problems.

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(答案→)A. meanwhile
B. therefore
C. otherwise
D. instead
解析：meanwhile同时，期间；therefore因此，所以；otherwise否则，另外；instead反而，代替。句意：私人汽车真的给人们提供了许多方便，同时它们也引起了许多问题。结合语境可知选Ａ。