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          Tom realized that he ________ his physics book at home when he reached school．
          A．leftB．had leftC．was leavingD．leaves
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          本題考查過去完成時(shí)的用法，由had+過去分詞。我們可以看到意識(shí)到和到都是過去的動(dòng)作，而忘記帶物理書則是在意識(shí)到之前，故為過去的過去，選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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