单项选择题

The exhibition is held ______our own expense and______ last year's prices. ( )

A．for, at
B．for, with
C．at, at
D．for, for
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As for the influence of Internet, nowhere ( ) the results more clearly than in the US.
A．we have seen
B．we had seen
C．seen we have
D．have we seen
单项选择题
They need a Certificate ( ) Quarantine.
A．about
B．of
C．for
D．on
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