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           The new policy allows a couple to have a second birth _____either is an only child.
          A．thoughB．ifC．unlessD．until
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意：新政策允許一對(duì)夫婦生二胎，如果其中有一人是獨(dú)生子女的話(huà)。這里用if引導(dǎo)條件狀語(yǔ)從句，A. though雖然，引導(dǎo)讓步狀語(yǔ)從句， C. unless除非，如果不，引導(dǎo)條件狀語(yǔ)從句，until直到，引導(dǎo)時(shí)間狀語(yǔ)從句，所以選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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