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          Half of the class       most of the work. Some of the work       really difficult.
            
          A.have done; is      B.has done; are      C.has done; is D.have done; are
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、A
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          Half of the class       most of the work. Some of the work       really difficult.
            
          A.have done; is      B.has done; are      C.has done; is D.have done; are
          

			
          
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           Half of  the class__________ most of the work. Some of the work ________really  difficult.
              
          A. have done ;  is                      B. has done ;are
              
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          Half of the class ________ most of the work．Some of the work ________ really difficult．
          

          

          [　　]
          

          A．have done, is
          

          

          B．has done, are
          

          

          C．has done, is
          

          

          D．have done, are
          

          

          

			
          
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