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				27．--Why are you so sad?--Because I      my backpack in the classroom and I can't  do my homework．A．have forgotten    B．have  left       C．leave          D．forget			【查看更多】
			


		
           
          


		
          
		
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          --Why are you so sad?
            
          --Because I          my backpack in the classroom and I can't do my homework．
            
          A．have forgotten            B．have left               C．leave         D．forget
          

			
          
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