单项选择题

I believe reserves of coal here are ______ to last for 50 years.

A. sufficient
B. efficient
C. enough
D. full
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单项选择题
Tom won a prize for good ______ at school.
A. behavior
B. action
C. act
D. acting
单项选择题
We are delighted ______ your success.
A. on
B. with
C. from
D. by
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