单项选择题

A) Fine, thank you. B) The same to you. C) How do you do D) I’m a teacher.
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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
Great changes ______ in Chongqing since 1997.
A) have taken place C) has been happened
B) have been taken place D) had been happened
单项选择题
The pupils said that a number of questions ______ too difficult.
A．are
B．is
C．were
D．was
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