With economy developing at great speed our city has quite a few changes in recent years.

问题补充：

With economy developing at great speed, our city has quite a few changes in recent years.

A. witnessed

B. accumulated

C. arisen

D. introduced

答案：

(答案→)A. witnessed

B. accumulated

C. arisen

D. introduced

解析：A.目击，见证 B.积累 C.出现，产生 D.介绍，引进 故选A。句意：随着经济的高速发展，我们的城市在最近几年见证了许多的改变。