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          It’s important __________ fire.
          A．to careB．be carefulC．to be carefulD．to be careful with
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          考查不定式作主語和固定短語。It是形式主語，不定式是真正的主語，be careful with小心。。。。。。所以選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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