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          I’m ___ duty today. I must clean the classroom _____ school.
          A．a(chǎn)fter; onB．in; beforeC．on; afterD．for; in
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C  
                      
          試題分析: 句意：我今天值班，我必須放學(xué)后把教室打掃干凈。on duty值班，after school放學(xué)后，故答案選C.
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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