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           It ’s our duty to_________people_________too many trees.
          A．stop; cutting downB．prevent, to cut down
          C．keep; cutting downD．make; cut down
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          stop/ prevent sb from doing sth,阻止某人做某事,from可省略。Keep sb from doing sth,from不可省。因此選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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