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          49. He goes _____ at 8 a.m. and comes _____ at 5 p.m. Today he is _____.
          A．on duty; off duty; on night dutyB．on his duty; off the duty; on night duty
          C．to duty; from duty; at night dutyD．in duty; out duty; at night duty
          			
          


			
		
          
		
				
          
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