单项选择题

The conference explored the possibility of closer trade links.

A．denied
B．investigated
C．stressed
D．created
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单项选择题
It is useless to argue with him once he has made up his mind.
A．settled
B．solved
C．said
D．decided
单项选择题
Almost all economists agree that nations gain by trading with one another.
A．work
B．profit
C．rely
D．prove
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