单项选择题

A stove is not up-to-date unless it has a mechanism ______ controlling the temperature.

A. capable of
B. able to
C. ability of
D. capacity of
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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
单项选择题
Tom won a prize for good ______ at school.
A. behavior
B. action
C. act
D. acting
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