单项选择题

The pot unearthed last month has been found to be a fake and to be ______.

A．valueless
B．invaluable
C．unworthy
D．priceless
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单项选择题
When the giant building ______, a likely or proper location was selected.
A．was established
B．was being established
C．had been established
D．was to be established
单项选择题
The wind was so strong that it tore the flag ______.
A．by half
B．at half
C．in half
D．by halves
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