单项选择题

We ______the help he gave us when we moved to our new house.

A．thanked
B．appreciated
C．obliged
D．owed
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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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