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
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单项选择题
Most trains______ long distances have a dining car and a club car where refreshments are served.
A．to go
B．to be going
C．that goes
D．going
单项选择题
The author could not fall asleep because_______.
A．it was too damp in the bedroom.
B．she had run out of sleeping pills.
C．she was in very poor health.
D．she felt very hungry.
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