单项选择题

His job ______ a great deal of travelling.

A．obliges
B．requests
C．involves
D．produces
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单项选择题
It was courageous ______ Mr. Dorris to try to save the drowning man.
A．for
B．of
C．about
D．with
单项选择题
Sooner or later, you will have to ______ what you did to her the day before yesterday.
A．pay for
B．pay up
C．pay out
D．pay back
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