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            I know Mr. Brown; we ______ to each other at an international conference.
            
              A. are introduced             B. are been introduced
            
              C. were introduced           D. had been introduced
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
             
          解析:
               
          由前句：know，說(shuō)明introduced為以前的被動(dòng)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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