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51. (     ) 

15. (   ) he has limited technical knowledge, the old worker has a lot of experience. 

• A、Although
  
  

• B、Unless
  
  

• C、As
  
  

• D、Since
  
  

46. How did Dickens see his childhood? 

• A、He felt grateful for it. 
  
  

• B、He felt it a pity that things weren't in his favor.
  
  

• C、He loved writing about it. 
  
  

• D、He chose to forget the bitterness about it.