单项选择题

What he had done is _______.（）

A. value
B. of valuable
C. of no value
D. of no valuable

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单项选择题
The professor worked for 7 hours at a ________.（）

A. stretch
B. extend
C. expand
D. prolong
单项选择题
A year later，with the nation‘s economy ________， Bush’s approval rating dropped below 40 percent.（）

A. in power
B. in trouble
C. in hand
D. in part
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