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．has
B．did
C．was
D．would
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单项选择题
I do not object ______ the evening with them.
A．to spend
B．to spending
C．of spending
D．spending
单项选择题
It is unfortunate that, owing to lack of money, these experiments must now be ______ before the objective has been achieved.
A．transferred
B．testified
C．terminated
D．transformed
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