单项选择题

The train came to an abrupt stop, making us wonder where we were.

A．an uncertain
B．a slow
C．an unexpected
D．a smooth
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单项选择题
We consume a lot more than we are able to produce.
A．waste
B．buy
C．use
D．sell
单项选择题
It's impolite to cut in when two persons are holding a conversation.
A．leave
B．talk loudly
C．stand up
D．interrupt
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