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				 The problem requires       .    A. studying with great care      B. to study carefully    C. to be studied without carelessness    D. taking great care of studying it			【查看更多】
			


		
           
          


		
          
		
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            The problem requires ______.
            
               A. studying with great care                   B. to study carefully
            
               C. to be studied without carelessness           D. taking great care of studying it
          

			
          
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           The problem requires ______.
          


          
 
          
  
  
          A．studying with great care
          
            		
  
  
          B．to study carefully
          
            		
 
          
 
          
  
  
          C．to be studied without carelessness
          
            		
  
  
          D．taking great care of studying it
          
            		
 
          

          


           
          

			
          
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