问题
选择题
Great changes ______ in China in the past 20 years.
A．took place
B．have taken place
C．were taken place
D．have been taken place
答案
答案：B
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Great changes ______ in China in the past 20 years.
A．took place
B．have taken place
C．were taken place
D．have been taken place
答案：B