He（）late into the night, but now he goes to bed early due to health reasons.

• A、used to work
  
  

• B、 used to working
  
  

• C、is used to working
  
  

• D、is used to work
  
  

57.(  )

1. Directions:In each of the following groups of words, there are four underlined letters or letter combinations marked A, B, C and D. Compare the underlined parts and identify the one that is different from the others in pronunciation. Mark your answer by blackening the corresponding letter on the Answer Sheet.（）

• A、sh（ou）t
  
  

• B、cl（ou）d
  
  

• C、m（ou）se
  
  

• D、 t（ou）gh