In the past few years, much improvement in the traffic.
A. there has been
B. there has had
C. there have been
D. there had been
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(答案→)A. there has been
B. there has had
C. there have been
D. there had been
解析:考查时态和there be 句型:句意:在过去的几年中,在交通方面有很多改善。时间状语是in the past few years和现在完成时连用,还有这句话是there be 句型,谓语和be动词后面的主语much improvement一致,因为是抽象名词,所以用has,选A。