单项选择题

It was a bold idea to build a power station in the deep valley, but it______ as well as we had hoped.

A．came off
B．went off
C．brought out
D．make out
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单项选择题
America will never again have as a nation the spirit of adventure as it ______before the West was settled.
A．could
B．was
C．would
D．did
单项选择题
To survive in the intense trade competition between countries, we must______ the qualities and varieties of products we make to the world-market demand.
A．improve
B．enhance
C．guarantee
D．gear
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