日韩亚洲一区中文字幕,日韩欧美三级中文字幕在线,国产伦精品一区二区三区,免费在线欧美性爱链接

      1. <sub id="o5kww"></sub>
        
<legend id="o5kww"></legend>
        <style id="o5kww"><abbr id="o5kww"></abbr></style>
        <strong id="o5kww"><u id="o5kww"></u></strong>
        

        2. 


          
	
          
		
	
          
	
          
		
          
			
		
          
		
          
	
          

          



          

          

          


          

          
	
          
	
          


			
          
				
          With the help of high technology, more and more new substances _____ in the past years. 

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

			
			
			
		
          



							
          
				相關(guān)習(xí)題
			
          	
						
          
			
          
				科目：高中英語
				來源：
				題型：
			
          
									
          With the help of high technology, more and more new substances____in the past years.
            
          A. discovered   B. have discovered   C. had been discovered   D. have been discovered
          

			
          
				查看答案和解析>>
			
          
		
          
				
          
			
          
				科目：高中英語
				來源：
				題型：
			
          
									
            With the help of high technology, more and more new substances ______ in the past years.
            
             A. discovered          B. have discovered 
            
          C. had been discovered  D. have been discovered
          

			
          
				查看答案和解析>>
			
          
		
          
				
          
			
          
				科目：高中英語
				來源：
				題型：
			
          
									
          With the help of high technology, more and more new substances ______ in the past years.
            
             A. discovered        B. have discovered  
            
          C. had been discovered  D. have been discovered
          

			
          
				查看答案和解析>>
			
          
		
          
				
          
			
          
				科目：高中英語
				來源：
				題型：
			
          
									
          With the help of high technology, more and more new substances            in the past years.
          A．discovered
          B．have discovered
          C．had been discovered
          D．have been discovered
          

			
          
				查看答案和解析>>
			
          
		
          
				
          
			
          
				科目：高中英語
				來源：2007年高考試題（上海卷）解析版
				題型：單項填空
			
          
									
           With the help of high technology, more and
more new substances ______ in the past years.
          


             A. discovered                  B.
have discovered 
          


          C. had been discovered         D.
have been discovered
          


           
          

			
          
				查看答案和解析>>
			
          
		
          
				
          
			
          
				科目：高中英語
				來源：
				題型：
			
          
									
          With the help of high technology, more and more new substances ______ in the past years. 
            
            A. discovered　  　　　  B. have discovered　  
            
            C. had been discovered  　　　 D. have been discovered
              
           
          

			
          
				查看答案和解析>>
			
          
		
          
				
          
			
          
				科目：高中英語
				來源：2010屆高三英語每周精析精練：動詞時態(tài)和語態(tài)（二）
				題型：單項填空
			
          
									
           With
the help of high technology, more and more new substances            in
the past years.
          


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


           
          

			
          
				查看答案和解析>>
			
          
		
          
				
          
			
          
				科目：高中英語
				來源：
				題型：單選題
			
          
									
          With the help of high technology, more and more new substances _______ in the past years.

          1. A.
            discovered
          2. B.
            have discovered
          3. C.
            had been discovered
          4. D.
            have been discovered
          

			
          
				查看答案和解析>>
			
          
		
          
				
          
			
          
				科目：高中英語
				來源：上海高考真題
				題型：單選題
			
          
									
          With the help of high technology, more and more new substances _____ in the past years. 
          

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

			
          
				查看答案和解析>>
			
          
		
          
				
          
			
          
				科目：高中英語
				來源：
				題型：
			
          
									
            
           With the help of high technology, more and more new substances ______ in the past years.
            
             A. discovered              B. have discovered 
            
          C. had been discovered  D. have been discovered
          

			
          
				查看答案和解析>>
			
          
		
          
					
          
	
          
		
          


          同步練習(xí)冊答案