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				43．A．While         B．As soon as       C．Before          D．Since			【查看更多】
			


		
     
    


		
    
		
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    He met many problems ______ he was going
over his lessons.
    


    
 
    
  
  
    A．before
    
      		
  
  
    B．a(chǎn)s soon as
    
      		
  
  
    C．since
    
      		
  
  
    D．while
    
      		
 
    

    


     
    

			
    
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    He met many problems           he
was going over his lessons.
    


    
 
    
  
  
    A．before 
    
      		
  
  
    B．a(chǎn)s soon as 
    
      		
  
  
    C．since 
    
      		
  
  
    D．while
    
      		
 
    

    


     
    

			
    
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    He met many problems           he
was going over his lessons.
    


    
 
    
  
  
    A．before 
    
      		
  
  
    B．a(chǎn)s soon as 
    
      		
  
  
    C．since 
    
      		
  
  
    D．while
    
      		
 
    

    


     
    

			
    
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    He met many problems           he was going over his lessons.
    A．before B．a(chǎn)s soon as C．since D．while
    

			
    
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    He met many problems            he was going over his lessons.
    A．before 
    B．a(chǎn)s soon as 
    C．since 
    D．while
    

			
    
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