单项选择题

Coal has been （） by natural gas as a major source of energy.

A．displaced
B．deposited
C．displeased
D．disposed

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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

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

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