单项选择题

Linda's been to Canada, ______ she

A．isn't
B．has
C．hasn't
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单项选择题
Telephone rang, sb. wants to speak to your father. And your father is in.Yon should say ______.
A．Wait a minute
B．Hold on, please
C．Please wait here
单项选择题
—You must be here at six tomorrow morning.—Sorry, I ______ be here so early.
A．can't
B．may
C．must
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