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          The Bunsen Burner is so named because it is thought ___________ by Robert Bunsen.
            
          A. to be invented               B. having been invented
            
          C. invented                     D. to have been invented 
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
             
          解析:
               
          本句考查動(dòng)詞的被動(dòng)語態(tài)和時(shí)態(tài)，it+is+動(dòng)詞ed形式，to do是固定的搭配用法。而Bunsen Burner的發(fā)明是過去發(fā)生的動(dòng)作，所以用完成時(shí)態(tài)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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