单项选择题

Our civilization cannot be thought of as ______ in a short period of time.

A．to have been created
B．to be created
C．having been created
D．being created
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单项选择题
The prince is ______ to the throne.
A．benefactor
B．hell
C．heir
D．heiress
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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