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          51.[2000上海] My sister met him at the Grand Theatre yesterday afternoon, so he
________ your lecture.
          

          
 
          
  
  
          A. couldn't have attended
          
            		
  
  
          B. needn't have attended
          
            		
 
          
 
          
  
  
          C. mustn't have attended
          
            		
  
  
          D. shouldn't have attended
          
            		
 
          

          

           
          
			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				答案：A
          提示：
          題目考察表達(dá)對過去事情的否定推測——could not have done
          

           
          


          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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