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
He came and ______ without saying a word.
A． go
B． went
C． going
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