单项选择题

Just then we had an important piece of work in hand, the generator that supplies the power to the whole works broke ______.

A．out
B．up
C．off
D．down
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单项选择题
He told me how the accident come ______.
A．out
B．along
C．about
D．into
单项选择题
Americans have been criticized for placing too much ______ on being on time.
A．emphasis
B．activity
C．bother
D．assistance
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