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          I'm happy ________________ you are happy.
          A.  if   B. unless  C. as long as
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          同樣是引導(dǎo)條件狀語(yǔ)從句，if強(qiáng)調(diào)的是“兩種可能性”，如果這樣，就會(huì)怎樣；如果那樣，就會(huì)怎樣。unless相當(dāng)于if not,如果不。as long as經(jīng)常用來(lái)表示說(shuō)話者的愿望，只有它符合題意，表示：你快樂(lè)，我才快樂(lè)；表達(dá)了我希望你快樂(lè)的意愿。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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