单项选择题

-- Have you ______ Beijing before
--Not Yet.

A．gone to
B．been to
C．been in
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单项选择题
Nobody but Mr. Lee and his wife ______ come.
A．have
B．has
C．is
单项选择题
A scientist will come to give us a talk ______ computer.
A．at
B．on
C．of
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