单项选择题

The firm's promise to increase our pay was a reluctant ______ to union demands, because the union would otherwise not go back to work.

A．response
B．reply
C．reaction
D．concession
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单项选择题
George's ability to learn from observations and experience ______ greatly to his success in public life.
A．owed
B．contributed
C．attached
D．related
单项选择题
I can ______ some noise while I'm studying, but I can't stand loud noises.
A．come up with
B．catch up with
C．put up with
D．keep up with
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