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          As is known to all , theory is based on practice and _______ serves practice.
          A．by chanceB．by turnC．in returnD．in turn
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          短語(yǔ)辨析。by chance偶然；by turn輪流；in return作為回報(bào)；in turn輪流，依次，轉(zhuǎn)而，反過(guò)來(lái)。句意：眾所周知，理論以實(shí)踐為基礎(chǔ)，反過(guò)來(lái)又應(yīng)用于實(shí)踐。所以選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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