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          【題目】________ the machine begins to work, you can’t stop it _____.
          A. While; soon B. For; right away
          C. Once; at once D. Until; immediately
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          【答案】C
          【解析】
          試題第一空考查連詞：while雖然，for因?yàn)椋?/span>once一旦until直到，第二空考查副詞，soon很快，right away立刻，at once立刻，immediately立刻，句意是：一旦機(jī)器開始工作，你就不能讓它停下。選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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