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          【題目】They did everything in their power to save the building dating back to the Qing Dynasty, but their efforts were  .
          A. in turnB. in time
          C. in vainD. in need
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          【答案】C
          【解析】
          試題分析:句意：他們?cè)谀芰Ψ秶鷥?nèi)盡一切努力去挽救始于清朝時(shí)期的建筑，但是他們的努力是徒勞的。A輪流；B及時(shí)；C徒勞；D需要。根據(jù)but可知后面和前面內(nèi)容是轉(zhuǎn)折關(guān)系，選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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