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            _____ Monday morning he wrote an article on grammar.  
            
          _____ Monday morning he had written an article on grammar.  
            
          A. By    B. On    C. At      D. ／ 
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
             
          解析:
               
          A.用on（at）＋過去時間狀語,句子用過去時；by＋過去時間狀語,句子用過去完成時. 
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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