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				 It is said that potato chips     by mistake about a hundred years ago.  A. invent B. invented C. are invented D. were invented			【查看更多】
			


		
           
          


		
          
		
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          It is said
that potato chips ____________ by mistake about a hundred years ago.
          


              
A. invent       B.
invented     C. are invented     
D. were invented
          


           
          

			
          
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          It is said that potato chips ______ by mistake about a hundred years ago. 
          

          [     ]
          A. invent 
          B. invented 
          C. are invented 
          D. were invented 
          

			
          
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           It is said that potato chips        by mistake about a hundred years ago.
              
             A. invent                        B.  invented                   C.  are invented       D. were invented
              
          

			
          
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          It is said that potato chips ________ by mistake about a hundred years ago. 
          


          A. invent
          


          B. invented
          


          C. are invented
          


          D. were invented
          

			
          
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          It is said that potato chips ________ by mistake about a hundred years ago．
            
          A．invent               B．invented           C．a(chǎn)re invented           D．were invented
          

			
          
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