With economy developing at great speed, our city has quite a few changes in recent years.
A. witnessed
B. accumulated
C. arisen
D. introduced
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(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。