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          You will not win the first prize ________ you work harder.
          A. if                  B. unless                 C. or
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意：除非你工作更努力點(diǎn)你就不會(huì)獲得一等獎(jiǎng)。A. if如果； B. unless除非； C. or否則，根據(jù)句意“除非”是unless，相當(dāng)于if not,所以此題選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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