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          ______ the work is difficult, all the workers are keeping on working .
          A．ButB．AlthoughC．AndD．So
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
           四個選項分別表示但是、盡管、和、因此，根據(jù)題意最佳答案為B，盡管這項工作很困難，所有工人都在堅持工作。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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