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          ---She broke her mother’s favourite vase______ she stood up.
           ---It’s a pity!
          A．whileB．a(chǎn)sC．a(chǎn)fter D．until
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意:-當(dāng)她站起來(lái)的時(shí)候，她打破了她媽媽最喜歡的花瓶。-真遺憾。while 當(dāng)……時(shí)候，引導(dǎo)時(shí)間狀語(yǔ)從句，從句中的動(dòng)詞必須是延續(xù)性的，這里的stand 是瞬間性動(dòng)詞，故Ａ不對(duì)；after 在……之后，不符合句意；D選項(xiàng)until 直到……時(shí)候，不符合句意。故選B。as 當(dāng)……時(shí)候，引導(dǎo)時(shí)間狀語(yǔ)從句。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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