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          The new term is coming. The students are busy __________ the classrooms. 
            
          A. clean                 B. cleans               C. to clean             D. cleaning
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、D
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          The new term is coming. The students are busy __________ the classrooms. 
            
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          The new term is coming．The students are busy ________ the classrooms．
          

          

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