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          21.[1994全國] 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)相反時虛擬語氣的構(gòu)成——should have done
          

           
          


          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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