单项选择题

I know something about Kunming. I ______ there many times.

A．have gone
B．have been
C．went
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Sometimes we can see ______ stars in the sky at night.
A．thousand of
B．thousands of
C．thousand
单项选择题
Shanghai is one of ______ cities in the world.
A．big
B．the bigger
C．the biggest
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