In the past few years much improvement in the traffic.A. there has been B. there has had

问题补充：

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

答案：

(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。