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				21.[1994全國(guó)] I told Sally how to get here, but perhaps I ________ for her.
          

          
 
          
  
  
          A. had to write it out
          
            		
  
  
          B. must have written it out
          
            		
 
          
 
          
  
  
          C. should have written it out
          
            		
  
  
          D. ought to write it out
          
            		
 
          

          

           
          
			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				答案：C
          提示：
          		題目考察表達(dá)與過去事實(shí)相反時(shí)虛擬語(yǔ)氣的構(gòu)成——should have done
          


           
          



          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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