单项选择题

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

A．efficient
B．sufficient
C．persistent
D．rich
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单项选择题
He had wanted a 25 % raise in pay, but after talking to his boss, he decided that a 5 % raise would have to______.(2002年中国人民大学考博试题)
A．suffice
B．satisfy
C．gratify
D．delight
单项选择题
He underwent four______operations in two weeks.
A．consistent
B．relative
C．successive
D．respective
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