单项选择题

Don’t smoke in the meeting-room, ()

A. do you
B. will you
C. can you
D. could you

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单项选择题
In winter, traffic accidents occur () on the highway

A. frequently  
B. suddenly    
C. usually   
D. rapidly
单项选择题
His hard work () when he won the prize.

A. paid off
B. showed of
C. rang off
D. kept off
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