单项选择题

Such birds have never been heard ______ at night.

A．to be sung
B．are singing
C．to sing
D．sing
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单项选择题
—Is it a recorded football match —No, it is ______ football match.
A．a lively
B．a living
C．an alive
D．a live
单项选择题
It's rude (无礼的，猛烈的) of you to shout ______ the room.
A．through
B．beyond
C．across
D．over
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