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          They have made so great progress      .
          A．three years agoB．for three years
          C．in the past three yearsD．before three years
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          考查時態(tài)�！癷n/over/for+一段時間”常和現(xiàn)在完成時連用。A用于一般過去時。句意“在過去的三年里，他們已經(jīng)取得了如此大的進(jìn)步�！惫蔬xC。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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