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Great changes ________ in China since the People’s Republic

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Great changes ________ in China since the People’s Republic of China _________ in 1949.
A. have taken place; was founded
B. has taken place; was founded
C. have been taken place; founded
D. took place; founded
A

“take place”无被动语态,由since引导的从句可知主句要用现在完成时,所以选A。