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				 Niagara falls       not as high as Victoria Falls.                   A. is       B. are       C. will be       D. must be			【查看更多】
			


		
           
          


		
          
		
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          Niagara falls _____ not as high as Victoria Falls.         
             A. is      B. are       C. will be       D. must be
           
           
          

			
          
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