单项选择题

Contrary to my expectations, the experiment ended ________ failure.

A．at
B．to
C．in
D．till
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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
单项选择题
The knife is a strong piece of ________ against the defendant.
A．proof
B．clue
C．indication
D．evidence
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