问题
选择题
There__________ great changes in our city in the past 10 years.
A．were
B．had
C．have been
D．have had
答案
答案：C
题目分析：句意：在过去的10年里，我们的城市发生了很大的改变。in the past 10 years是现在完成时的标志词，用现在完成时，故选C.
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