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          He has a hard time          the problem.
          A．works outB．working outC．work outD．works out
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          表示在某事上很費(fèi)力，可用have a hard time （in）doing sth，故本題選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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