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          More historical buildings in the old town will fall down ________we try our best to protect them.
          A．ifB．sinceC．unlessD．in order that
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：句意為：如果我們不盡力保護(hù)，老城里更多的歷史性建筑將倒塌。if：如果， since：自從……以來(lái)， unless ：如果不， in order that：為了。結(jié)合語(yǔ)境可知應(yīng)故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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