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          Give them a hand this time and I am sure they will offer theirs ______ in the future.
          A．by turns B．in turn
          C．a(chǎn)t turnD．in return
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          by turns“輪流”；in turn“依次、反過(guò)來(lái)”；at turn無(wú)此短語(yǔ)；in return“作為回報(bào)”。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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