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           It’s necessary _________ us _________ more trees in spring every year.
          A．of; to plantB．for; to plant
          C．of; plantingD．for; planting
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意：每年春季栽更多的樹(shù)對(duì)我們來(lái)說(shuō)是必須的。這是一固定句式“It’s+形容詞+for sb.to do sth.”，故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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