单项选择题

Trade ______ for a country to exchange its surplus goods for some services abroad.

A．makes possible
B．takes it possible
C．get it possible
D．makes it possible
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单项选择题
The ultimate authority for Canada's fiscal policy is ______ the hands of the federal, and the provincial governments.
A．on
B．by
C．for
D．in
单项选择题
Some of the national heroes would ______ some principle all their lives.
A．follow
B．take
C．carry
D．serve
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