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          I heard him ________ in the hall when I passed by．
            
          A．to practise singing                                      B．practise singing 
            
          C．practising singing                                       D．practise to sing
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、C
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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				科目：初中英語
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          I heard him ________ in the hall when I passed by．
            
          A．to practise singing                                      B．practise singing 
            
          C．practising singing                                       D．practise to sing
          

			
          
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