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				16．It's about three years         my brother joined the army．A．before         B．a(chǎn)fter          C．since           D．when			【查看更多】
			


		
           
          


		
          
		
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          It's about three years                my brother joined the army．
            
          A．before                 B．a(chǎn)fter                    C．since                     D．when
          

			
          
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