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				28．The exercises are extremely difficult, but half of the class    them ahead of time．    A．has already finished        B．will finish    C．have already finished       D．finishes			【查看更多】
			


		
           
          


		
          
		
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          The exercises are extremely difficult, but half of the class         them ahead of time.
            
          A．has already finished                                     B．will finish
            
          C．have already finished                                   D．finishes
          

			
          
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