单项选择题

This species has nearly （died out） because its habitat is being destroyed.

A．turned dead
B．passed by
C．become extinct
D．carried away
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单项选择题
Come out, or I’ll （bust） the door down.
A．shut
B．set
C．beat
D．break
单项选择题
The methods of communication used during the war were （primitive）.
A．reliable
B．effective
C．simple
D．alternative
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