10. My father knows Kate's father. They (   ) to each other at a conference. 

• A、had been introduced
  
  

• B、are introduced
  
  

• C、were introduced
  
  

• D、have been introduced
  
  

55. (     ) 

38. Which one in the following can substitute the word"reckon"?

• A、Suspected
  
  

• B、Estimated. 
  
  

• C、Proved.
  
  

• D、Reported.