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          精英家教網 > 高中英語 > 題目詳情
          

			
          
				
          You must keep on working in the evening _____ you are sure you can finish the task in time.

          A. as 
          B. if 
          C. when 
          D. unless 
          			
          

			
			
			
		
          



							
          
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