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				24．---When did he work         the  railroad?			【查看更多】
			


		
           
          


		
          
		
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          ---When did he work ______ the railroad?
          ---From 1904 to 1909．

          1. A.
            at
          2. B.
            on
          3. C.
            for
          4. D.
            of
          

			
          
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          —When did he work_______the railroad?   
          —From 1904 to 1909.    
          

          [     ]
          A. in           
          B. on          
          C. at           
          D. of
          

			
          
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          －When did he work ________ the railroad?
          

          －From 1904 to 1909．
          

          

          [　　]
          

          A．

          at
          

          

          B．

          on
          

          

          C．

          for
          

          

          D．

          of
          

          

          

			
          
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