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          The children were worried about their mother. They didn’t go to bed ___  their mother came back..
          A．whenB．whileC．untilD．a(chǎn)fter
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          

          解析試題分析：句意：孩子們擔(dān)心他們的媽媽，直到媽媽回來(lái)后他們才上床睡覺(jué)。not…until…直到……時(shí)候才……。故選C。
          考點(diǎn)：考查連詞。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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