单项选择题

I'm sorry to have taken up too much of your （）time.

A. worthy   
B. valueless   
C. valuable   
D. priceless

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单项选择题
Whose （） is it to answer the question this time

A. time      
B. position    
C. duty     
D. turn
单项选择题
As a（）for his contribution, he got a new car from the company

A. award    
B. medal    
C. prize     
D. reward
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