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           ________ you have to do the job, you should try your best to do it well even though it may be very difficult for you.
          A．SinceB．While
          C．UnlessD．Though
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          A 考察連詞。句義：既然你要做這份工作，就盡力去做。Since既然，while然而；unless除非；though盡管；根據(jù)句義說明A正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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