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          You have failed two tests. You’d better start working harder, ____ you won’t pass the course. 
          A．a(chǎn)ndB．soC．butD．or
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
              
          試題分析: 句意：——你已經(jīng)兩次考試不及格了。你最好現(xiàn)在開始努力，否則你這會(huì)掛科的。A并且；B所以；C但是；D否則。從句意可知此處指如果不努力將出現(xiàn)的結(jié)果，是對(duì)對(duì)方的警告，故答案選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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