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          ---How long has your brother been working in this factory?
           ---_____he dropped from school in 2010.
          A．WhenB．UntilC．SinceD．Before
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：考查連詞。A當(dāng)……時候；B直到；C自從；D在……之前。句意：——你哥哥在這家工廠工作了多久？——自從2010年他從學(xué)校輟學(xué)。故C正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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