单项选择题

Great changes ______ in Chongqing since 1997.
A) have taken place C) has been happened
B) have been taken place D) had been happened
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单项选择题
The pupils said that a number of questions ______ too difficult.
A．are
B．is
C．were
D．was
单项选择题
Albert Einstein is a man ______ material things mean nothing.
A. for whom
B. to whom
C. with whom
D. in whom
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