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
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单项选择题
I know something about Kunming. I ______ there many times.
A．have gone
B．have been
C．went
单项选择题
Bob won't stop trying ______ he gets what he wants.
A．as
B．that
C．till
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