单项选择题

He ______ his life ______ the abolition of. slavery.

A. dedicated... to
B. devoted... for
C. spent... in
D. gave ... for
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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
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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