Thelightisstillon.Theytoturnit

The light is still on. They ___ to turn it off when they left the room.

A．must forget	B．could have forgotten
C．may forget	D．must have forgotten

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A．defend	B．reserve
C．challenge	D．preserve

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A．accurately	B．cautiously
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A．at an end	B．on end
C．by the end	D．in the end

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A．gradually	B．loosely
C．exactly	D．frequently

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A．useless	B．important
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