单项选择题

You have never been to the USA, ______

A．have you
B．do you
C．haven't you
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单项选择题
He heard someone ______ him, so he stopped to have a look.
A．calls
B．call
C．calling
单项选择题
-- Have you ______ Beijing before--Not Yet.
A．gone to
B．been to
C．been in
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