单项选择题

The U. S 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
Jessica is a very religious girl; she believes that she is always ______ supported by her god.
A．spiritually
B．typically
C．historically
D．officially
单项选择题
Discovering consists of seeing what everybody has seen and ______ what nobody has thought.
A．think
B．thinking
C．thought
D．to think
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