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          We can easily become unhappy_____ we work out our problems in our daily life. 
          A．a(chǎn)fter B．if C．until D．unless
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          連詞用法。句意：在日常生活中，如果我們解決不了問題，我們很容易變的不高興。unless＝if not如果不……；after在……之后；if如果；until直到……為止。故選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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