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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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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Which of these trains is the one () goes to Nanjing

A. which     
B. of which    
C. of these     
D. that
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