单项选择题

They hung ______ at home waiting for a phone call and consequently missed the train.

A．up
B．back
C．about
D．down
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单项选择题
He will probably be awarded a Nobel Prize on account of his ______ achievements in chemistry.
A．high
B．worthwhile
C．outstanding
D．powerful
单项选择题
The French Revolution was a period of ______ , but produced some great literature.
A．chaos
B．interest
C．imagination
D．success
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