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				 Up to Tuesday’s attack, the worst school shooting in the U.S. was in March 1998 in Jonesbora,       two boys, aged 11 and 13, shot and killed a teacher and four girls.   A. while    B. where      C. when      D. then			【查看更多】
			


		
           
          


		
          
		
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          Up to Tuesday's attack, the worst school shooting in the U. S. was in March 1998 in Jonesboro,________ two boys, aged 11 and 13, shot and killed a teacher and four girls.
            
               A. while         B. where       C. when        D. then
          

			
          
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            Up to Tuesday's attack, the worst school shooting in the U. S. was in March 1998 in Jonesboro,______two boys, aged 11 and 13, shot and killed a teacher and four girls.
            
          A. while         B. where          C. when         D. then
          

			
          
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          Up to Tuesday's attack, the worst school shooting in the U. S. was in March 1998  in Jonesboro, _______ two boys, aged 11 and 13, shot and killed a teacher and four girls.
            
          A. while　　　　 B. where　　　 C. when　　　  D. then
              
           
          

			
          
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          Up to Tuesday's attack, the worst school shooting in the U. S. was in March 1998 in Jonesboro,______two boys, aged 11 and 13, shot and killed a teacher and four girls.

          1. A.
            while
          2. B.
            where
          3. C.
            when
          4. D.
            then
          

			
          
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           Up to Tuesday's attack, the worst school shooting in the U. S. was in March 1998 in Jonesboro, two boys, aged 11 and 13, shot and killed a teacher and four girls.
            
          A. while         B. where       C. when        D. then
          

			
          
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