单项选择题

Buck Helm, a retired salesman, survived ______ alive for 90 hours in his car.

A．burying
B．having buffed
C．being buffed
D．to be buried

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单项选择题

If the world is to remain peaceful the utmost effort must be made by nations to limit local ______.

A．collisions
B．combats
C．contradictions
D．conflicts

单项选择题

I think that I committed a ______ in asking her because she seemed very upset by my question.

A．blunder
B．revenge
C．reproach
D．scandal

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