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Great changes __ in the city in the past 20 years, and a lot of factories ____. A．have been taken pl...
题目内容：
Great changes __ in the city in the past 20 years, and a lot of factories ____.
A．have been taken place; have been set up
B．have taken place; have set up
C．have taken place; have been set up
D．were taken place; were set up
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