Q:
      
      
         
            
In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.
 
You have been working very hard (A)/ for the past two years.(B)/ isn't it? (C)/ No Error (D)
         
       
      
      
      
          
      
      
      
      
      
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