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In the last few years，there________gre
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问题：
[单选] In the last few years，there________great changes in the country．
A . had been
B . were
C . have been
D . has been
参考答案:
问题：
[单选] In the last few years，there________great changes in the country．
A . had been
B . were
C . have been
D . has been
参考答案: