_云南成考网

Look out!Don’t get too close to the house____roof is under repair．

• A、whose

• B、which
  

• C、of which
  

• D、that

54.__________.

 ____he has limited technical knowledge，the old worker has a lot of experience．

• A、Although
  
• B、Unless
  
• C、As
  
• D、Since