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          _____ three influenza type A virus subtypes（子類型） have been found in pigs．
          A．By farB．As far as C．So farD．Till far
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          短語辨析。     A．更，尤其 B．至于 C．迄今為止 D．直到遠(yuǎn)方。句意：迄今為止，耽擱流感A型病毒子類型已經(jīng)在實(shí)驗(yàn)品中被發(fā)現(xiàn)。故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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