单项选择题

America will never again have as a nation tee 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
Many wounded soldiers died because they had been left ______ for two days.
A．unattended
B．unattended to
C．not attended to
D．unattending
单项选择题
Statistics is a discipline ______ all the other sciences.
A．affected
B．affecting
C．to be affected
D．being affected
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