_合肥成考网

16. I always regretted not (   ) more when I was an undergraduate. 

• A、learning
  
  

• B、having learnt
  
  

• C、to learn
  
  

• D、to have learnt
  
  

39. This selection was probably written to (   ). 

• A、show how lazy cats are
  
  

• B、talk about the habits of cats
  
  

• C、tell about famous people and their habits
  
  

• D、persuade people to take naps
  
  

51. (     )