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          He met many problems------ he was going over his lessons.
          A．beforeB．a(chǎn)s soon asC．sinceD．while
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D 
          考查連詞。此句中主句中是一般過去時，而從句中是過去進(jìn)行時，故用while。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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