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If you have lost a library book, you have to _________ it.   
  A. find outB. look afterC. pay for D. take care   
  答案:C(选择A的同学要注意语境)   
  
He will call me as soon as he _________ the city.   
  A. reaches B. reached   
  C. will reachD. is reaching   
  答案:A(选择B的同学要注意主将从先)   
  
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