单项选择题

We must make ( ) that the goods were packed in gunny bags of 50kgs net each.

A．clear
B．it clear to you
C．clear to you
D．it is clear
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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
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