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				30．It's         difficult for us         climb up the mountain．A．very; can't       B．too;  not        C．too;  to        D．very; to			【查看更多】
			


		
           
          


		
          
		
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          It's               difficult for us                climb up the mountain．
            
          A．very; can't             B．too; not           C．too; to          D．very; to
          

			
          
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