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          My father was preparing for his speech __ my mother was doing some washing last night.
          A．ifB．whileC．unlessD．until
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          考查時(shí)間狀語(yǔ)從句。句意“昨晚我爸爸正在為演講做準(zhǔn)備，而媽媽正在洗衣服�！眞hile表對(duì)比，前后都用進(jìn)行時(shí)。故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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