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          She ____ on her homework in her study now . 
            
           A . must work B . can work C . must have worked D . must be working
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D。
             
          解析:
               
          對正在發(fā)生的事進(jìn)行推測。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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