单项选择题

In winter, traffic accidents occur () on the highway

A. frequently  
B. suddenly    
C. usually   
D. rapidly

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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
单项选择题
The plant is dead. I () it more water.

A. will give    
B. would have given  
C. must give    
D. should have given
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