48. The colonists defeated the British at last because (   ). 

• A、American people fought for freedom bravely
  
  

• B、Washington led the army correctly
  
  

• C、French helped them
  
  

• D、All the above are right. 
  
  

12. So seriously (   ) in the earthquake that he had to quit school and stay at home for recovery. 

• A、is he injured
  
  

• B、he is injured
  
  

• C、was he injured
  
  

• D、were he injured
  
  

54. (    )