单项选择题

I saw them bending with great ______ over the machines.

A．concentration
B．endeavor
C．tolerance
D．absorption
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单项选择题
The purpose of the official inquiry is to ______ the true facts leading to the loss of the ship at sea.
A．come for
B．come at
C．come into
D．come over
单项选择题
The archaeologist ______ that the vase was 3500 years old.
A．utilized
B．estimated
C．sustained
D．upheld
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