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8. My uncle has two daughters, and (   ) are doctors. 

• A、all of them
  
  

• B、both of them
  
  

• C、neither of them
  
  

• D、two of them
  
  

11. Look out! Don't get too close to the house (   ) roof is under repair. 

• A、whose
  
  

• B、which
  
  

• C、of which
  
  

• D、that
  
  

55. (     )