单项选择题

An oil-field in the North Sea can cost hundreds of millions of pounds to bring into ______.

A．produces
B．productivity
C．production
D．products
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单项选择题
No document is allowed to be ______ to public by any party without the written consent of other party.
A．released
B．relieved
C．related
D．retained
单项选择题
The telephone rates ______ by 20 percent last year.
A．raised
B．aroused
C．arose
D．rose
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