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          __ is really hard __ them to climb Mount Tai. 
          A．This, toB．It, toC．This, forD．It, for
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：句意：對(duì)于他們來(lái)說(shuō)，爬泰山太難了。強(qiáng)調(diào)句式， It is adj for sb to do sth，做某事對(duì)某人來(lái)說(shuō)怎么樣。本句中it是形式主語(yǔ)，指代后面不定式內(nèi)容做形式主語(yǔ)，this無(wú)此用法。故選D. 
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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