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          If there is an intruder _____the campus, students should be _____through an announcement, ______teachers should lock their classrooms to keep the children safe.
          A．in, warned, after thatB．a(chǎn)t, warned, before which
          C．on, informed, after whichD．in, informed, before which
          			
          


			
		
          
		
				
          
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