单项选择题

These machines all look much the same, but each has its ________ function.

A．extraordinary
B．special
C．peculiar
D．exceptional
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单项选择题
Contrary to my expectations, the experiment ended ________ failure.
A．at
B．to
C．in
D．till
单项选择题
The old building is in a good state of ________ except for the wooden floors.
A．observation
B．preservation
C．conservation
D．compensation
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