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          Even the top students in our class didn' t work out the problem. So it          be very difficult,
            
          A. need           B. must.              C. can t           D. shouldn′t
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、B
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          Even the top students in our class didn' t work out the problem. So it          be very difficult,
            
          A. need           B. must.              C. can t           D. shouldn′t
          

			
          
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