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				 ―Is Liu Hua serving in  the army?  ―No, but he        in the army for  three years.  A. served         B. has served      C. is serving       D. would serve			【查看更多】
			


		
           
          


		
          
		
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           ----Does Liu Hua serve in the army?
            
          ----No,but he ___in the army for three years.
            
          A、served   B、has served   C、is serving   D、would serve
          

			
          
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          ----Does Liu Hua serve in the army?
            
          ----No,but he__________in the army for three years.
            
          A、served    B、has served    C、is serving      D、would serve
          

			
          
				查看答案和解析>>
			
          
		
          
				
          
									
          ----Does Liu Hua serve in the army?
            
          ----No,but he　　 in the army for three years.
            
          A、served　  B、has served　  C、is serving　　  D、would serve
              
           
          

			
          
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