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          (2013·甘肅蘭州名校高三檢測(cè))The professor told me to start the research right now, ________ I was sure to fall behind.
          A．orB．soC．butD．a(chǎn)nd
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          A　句意：教授讓我立刻開(kāi)始研究工作，否則我肯定會(huì)落后的。根據(jù)句意選用or，意為否則。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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