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．did
C．would
D．was
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单项选择题
We'll ______ you as soon as we have any further information.
A．notify
B．signify
C．communicate
D．impart
单项选择题
It took a lot of imagination to come up with such an ______ plan.
A．bright
B．clever
C．brilliant
D．ingenious
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