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          精英家教網 > 初中英語 > 題目詳情
          
			
          
				
          --When _____ the abacus _____?   -- In the sixth century by the Chinese people.
          A．is, inventedB．did, inventC．was, inventedD．does, invent
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          此題考查的是被動語態(tài)，由be+過去分詞。算盤是人發(fā)明的，它是動作的承受者。發(fā)明在過去，故用was invented,選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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