_天津成考网

54. (    )

10. Only then (   ) that he had left his key on his office. 

• A、he realized
  
  

• B、did he realize
  
  

• C、had he realized
  
  

• D、he had realized
  
  

35. (     )

• A、made up
  
  

• B、shown up
  
  

• C、looked up
  
  

• D、picked up