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          Experiments of this kind        in China before the Cultural Revolution in China. 

          A. have conducted 
          B. have been conducted 
          C. had conducted  
          D. had been conducted
          			
          

			
			
			
		
          



							
          
				相關(guān)習(xí)題
			
          	
						
          
			
          
				科目：高中英語
				來源：浙江省模擬題
				題型：單選題
			
          
									
          Experiments of this kind        in China before the Cultural Revolution in China. 
          

          [     ]
          A. have conducted 
          B. have been conducted 
          C. had conducted  
          D. had been conducted
          

			
          
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