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          Look!One of the children _____ in the river.
          A．was swimmingB．is swimmingC．a(chǎn)re swimmingD．were swimming
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          根據(jù)Look!，用現(xiàn)在進(jìn)行時(shí)，且主語(yǔ)是!One of the children，謂語(yǔ)要用單數(shù)，選B。，
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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