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
______ he daydreamed, Peter saw figures in the sky.
A．Until
B．Since
C．While
D．During
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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