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15. Would you tell me which answer is the right one (   ) the question?

• A、of
  
  

• B、on
  
  

• C、for
  
  

• D、to
  
  

13. It was buying game cards that cost Jim most of the money that he (   ) on learning. (   ) 

• A、might have spent
  
  

• B、must have spent
  
  

• C、should have spent
  
  

• D、 would have spent
  
  

54. (   )