单项选择题

I have （） much time and thought on the problem, but I am no nearer to finding a solution.

A. exposed
B. extended
C. exhausted
D. exerted

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单项选择题
The new laws threaten to（）many people of most freedom.

A. deprive
B. startle
C. refute
D. destine
单项选择题
A long time ago, at a national conference on biology, he cautiously（）his new theory of life.

A. produced
B. relieved
C. advanced
D. thrust
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