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          Listen! Someone _____ songs.
          A．a(chǎn)re singingB．singingC．singD．is singing
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          listen，是現(xiàn)在進行時的標志詞。Someone作主語一般看作單數(shù)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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