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In the 20th century,great changes______in our city,________i

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In the 20th century,great changes______in our city,________is developing very fast now.
A.took place,which
B.have taken place,where
C.have happened,which
D.took place,that
正确:C
in the 20th century 体现现在完成时,which指代前面的our city(非限定性定语从句).
再问: 那第二个空which&where怎么区分呢?
再答: which做第二句。。。is developing。。。。的主语。