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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单项选择题
--Must I turn off the light when I leave--No, ______.
A．you mustn't
B．you can't
C．you needn't
单项选择题
We all enjoyed ______ on the farm.
A．works
B．working
C．work
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