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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