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 knife is a strong piece of ______ against the defendant.
A．proof
B．clue
C．indication
D．evidence
单项选择题
The person who ______ this type of research deserves our praise.
A．originated
B．manufactured
C．generated
D．estimated
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