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          — Do you know when the technology for hybrid rice            to the United States? 
          — Yes. In 1980. 

          A. introduced
          B. introduces 
          C. is introducing 
          D. was introduced 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				D				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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				科目：初中英語
				來源：河北省期末題
				題型：單選題
			
          
									
          — Do you know when the technology for hybrid rice            to the United States? 
          — Yes. In 1980. 
          

          [     ]
          A. introduced
          B. introduces 
          C. is introducing 
          D. was introduced 
          

			
          
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