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          Personal computers        in 1976．It has changed the whole world． 
            
          A． are invented                    B． invented      
            
          C． were invented                   D． have been invented
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、C
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          Personal computers        in 1976．It has changed the whole world． 
            
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