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          It is our duty ______much attention to ________ our best to keep our city clean.
          A．to pay, tryingB．paying, trying
          C．pay, tryD．to pay, try
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          

          解析試題分析：句意: 注重盡我們最大努力保持我們的城市清潔是我們的責(zé)任。pay attention to是固定詞組，注意……。try one’s best to do 盡力做，是固定詞組。不定式to pay much attention to try our best to keep our city clean是句子的真正主語，代詞it是形式主語。據(jù)句意，故選A。
          考點(diǎn)：考查動詞短語和非謂語動詞。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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