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				 The book was written in 1946,        the education system has witnessed great changes.    A. since when     B. after which     C. since then      D. during which			【查看更多】
			


		
           
          


		
          
		
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          The book was written in 1946, _____ the education system has witnessed great changes.
          A．whenB．during whichC．since whenD．since then
          

			
          
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          The book was written in 1946, _______ the education system has witnessed great changes.
          A．since thenB．whenC．since whenD．during which
          

			
          
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          The book was written in 1946, _______ the education
system has witnessed great changes.
          


          A．since then         B．when             C．since when        D．during which
          


           
          

			
          
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          The book was
written in 1946, _____ the education system has witnessed great changes.
          


            A.
when               
B. during which      C. since
when         D. since then
          


           
          

			
          
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          The book was written in 1946, ____ the
education system has witnessed great changes.
          


          
 
          
  
  
          A．when
          
            		
  
  
          B．during which
          
            		
  
  
          C．since then
          
            		
  
  
          D．since when
          
            		
 
          

          


           
          

			
          
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