单项选择题

The contract is ______ unless it is officially stamped.

A．invalid
B．invaluable
C．precious
D．deliberate
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单项选择题
It was very difficult to build a power station in the deep valley, but it ______ as we had hoped.
A．came off
B．went off
C．brought out
D．made out
单项选择题
Their business flourished when they moved to downtown are（）

A. prevailed
B. failed
C. boomed
D. injured
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