Great changes ______ in Shanghai since the beginning of the reform and opening-up policy.a、took place b、 has taken place c、 has been taken place d、 have taken place

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Great changes ______ in Shanghai since the beginning of the reform and opening-up policy.a、took place b、 has taken place c、 has been taken place d、 have taken place

Great changes ______ in Shanghai since the beginning of the reform and opening-up policy.a、took place b、 has taken place c、 has been taken place d、 have taken place
Great changes ______ in Shanghai since the beginning of the reform and opening-up policy.
a、took place
b、 has taken place
c、 has been taken place
d、 have taken place

Great changes ______ in Shanghai since the beginning of the reform and opening-up policy.a、took place b、 has taken place c、 has been taken place d、 have taken place
d
take place “发生”,是不及物动词,没有被动语态,排除C
有since 的主句用现在完成时,排除a
主语不是单三,排除b