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
The background music in an assembly line is designed ______.
A．being not listened to
B．not being listened to
C．to be not listened to
D．not to be listened to
单项选择题
It is quite common for a working man to make ______ for his old age by putting aside enough money to live on.
A．adjustment
B．supply
C．assurance
D．provision
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