单项选择题

21（）

A．plan
B．use
C．idea
D．means

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单项选择题
The town was no longer the sleepy little village ______.
A．it has been being
B．it was
C．it has been
D．it had been
单项选择题
Our earth is full of sound because it is full of ______ like trucks rolling along the highway or jets climbing into the sky.
A．travel
B．motion
C．construction
D．excitement
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