单项选择题

They went through the rooms, being careful to touch nothing, as they did not Want to（）the police in their search for fingerprints.

A．intervene
B．hint
C．hamper
D．reverse

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单项选择题
He thought the door was locked, but he turned the （） and the door opened.

A．knock
B．handle
C．knob
D．knot
单项选择题
The solution, if that is the case, is to install a pressure-reducing（）on the water system.

A．shaft
B．shelf
C．axis
D．valve
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