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          —Look at the sign! 
          —Oh, I see.We _______ waste water.
          A．canB．mustC．mustn’tD．needn’t
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          情態(tài)動(dòng)詞的用法。根據(jù)標(biāo)志可知為禁止浪費(fèi)水的標(biāo)志。表示禁止命令用must. 因此選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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