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    21、Great changes ______ since the People’s Republic of China was founded 60 years ago．

    A．took place                                           B．have taken place        

    C．were taken place                                 D．have been taken place

    21、B

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    Great changes ______ since the People’s Republic of China was founded 60 years ago．

    A．took place                                           B．have taken place        

    C．were taken place                                 D．have been taken place

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