单项选择题

I got a new battery for my recorder only last week, but it seems to have ______ already.

A．worn out
B．run down
C．knocked off
D．gone off
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单项选择题
He used to play badminton with you, ______.
A．didn't he
B．used he
C．did he
D．gone off
单项选择题
The university board of trustees deemed it urgent that a new provost ______ to replace Mr. Dannison who had been diagnosed with cancer.
A．be selected
B．would be selected
C．must be selected
D．was selected
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