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          We ______ careful when we are walking across the road.There are too many vehicles now.
            
          A. can be                B. may be                    C. must be
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、C
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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