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


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          翻譯：當他正在復(fù)習(xí)他的功課時他遇見了很多困難
          A在。。。。之前
          B一。。。。就
          C自從
          D當。。。。時
          故選D
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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