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．has
B．did
C．was
D．would
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单项选择题
This article was written ______ for China Daily.
A．extensively
B．exceedingly
C．excessively
D．exclusively
单项选择题
Classification is a useful ______ to the organization of knowledge in any field.
A．means
B．approach
C．mode
D．manner
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