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          He is rather difficult to make friends with, but his friendship, ____, is more true than any other. 
            
                   A. once gained                     B. when to gain
            
                   C. after is gained                   D. while gaining
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A                        
             
          解析:
               
          once gained是狀語從句的省略, 相當于once it is gained。   
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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