单项选择题

China has ______ for over 20 years.

A． develop
B． developed
C． developing
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单项选择题
It is the first time that you have been to our country, ______
A． haven't you
B． don't you
C． isn't it
单项选择题
Let's go to visit Professor Wang, ______ we
A． would
B． shall.
C． wouldn't
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