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				31． Personal computers     in 1976． It has changed the whole world． A．  are invented    B． invented      C． were invented  D． have been invented			【查看更多】
			


		
     
    


		
    
		
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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
    

			
    
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    Personal computers ________ in 1976．It has changed the whole world．
    

    

    [　　]
    

    A．have been invented
    

    

    B．was invented
    

    

    C．were invented
    

    

    D．are invented
    

    

    

			
    
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    Personal computers ________ in 1976．It has changed the whole world．
    

    

    [　　]
    

    A．have been invented
    

    

    B．are invented
    

    

    C．were invented
    

    

    D．invented
    

    

    

			
    
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    Personal computers ________ in 1976．It has changed the whole world．
    

    

    [　　]
    

    A．have been invented
    

    

    B．are invented
    

    

    C．were invented
    

    

    D．invented
    

    

    

			
    
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    Personal computers ________ in 1976. It has changed the whole world.
    

    [　　]
    
    

    

    

    A．have been invented
    		


    B．are invented
    		

    

    

    C．were invented
    		


    D．invented
    		

    

    

    

    

			
    
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