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          We must do everything we can          waste water from running into rivers.
          A．keepB．keptC．to keepD．keeping
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：句意：為了組織廢水流進河里，我們必須做我們能做的一切事情。to keep waste water from running into rivers.表示目的，we can，后省略了do，做everything的定語，故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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