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				37．A．for      B．in  C．a(chǎn)t        D．since			【查看更多】
			


		
           
          


		
          
		
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          The factory opened ________ 1989.
          

          [　　]
          

          

          A．for
          B．since
          

          C．in
          D．a(chǎn)t
          

          

          

			
          
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          She won her first gold medal ________ 1991.
          

          [　　]
          

          

          A．for
          B．a(chǎn)t
          C．in
          D．since
          

          

          

			
          
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          He has worked in the factory______ five years ago．
            
          A． for         B． at         C． since          D． about
          

			
          
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          I've waited _________an hour and now I'm leaving.
          

          [　　]
          
          

          

          

          A．since
          		


          B．in
          		

          

          

          C．at
          		


          D．for
          		

          

          

          

			
          
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          His grandpa has been ill ______ a few days.
          

          [　　]
          
          

          

          

          A．in
          		


          B．since
          		


          C．at
          		


          D．for
          		

          

          

          

          

			
          
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