问题补充:
Great changes in our country since 1990.
A. were taken place
B. took place
C. have taken place
D. have been taken place
答案:
A. were taken place
B. took place
(答案→)C. have taken place
D. have been taken place
解析:考查被动语态和现在完成时。句意“自从1990年以来,我们国家复数了巨大的变化。”take place没有被动形式,排除A、D;since+时间点常用于现在完成时。故选C。