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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
  
  

11. It was after she was ill (   ) she realized the importance of health.

• A、that
  
  

• B、which
  
  

• C、since
  
  

• D、as
  
  

51. (    )