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
Almost all economists agree that nations gainby trading with one another.
A．work
B．profit
C．rely
D．prove
单项选择题
The train came to an abruptstop, making us wonder where we were.
A．an uncertain
B．a slow
C．an unexpected
D．a smooth
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