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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单项选择题
As a writer, he turned out three novels that year.
A．refused
B．read
C．produced
D．accepted
单项选择题
It's impolite to cut in when two persons are holding a conversation,
A．leave
B．talk loudly
C．stand up
D．interrupt
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