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				28．Students must keep their eyes             and listen to the teacher           ．  A．open,careful B．open,carefully  C．opened,carefully  D．opened,careful			【查看更多】
			


		
     
    


		
    
		
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    Students must keep their eyes __________ and listen to the teacher __________．
      
    A．open；careful    B．open；carefully    C．opened；carefully    D．opened；careful
    

			
    
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