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          You’ll start having positive results            you replace negative thoughts with positive ones .
          A．sinceB．unlessC．until D．once
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：句意：一旦你用積極的思考代替消極的思考，你將開(kāi)始有積極地結(jié)果。since自從，引導(dǎo)時(shí)狀語(yǔ)從句；unless除非，引導(dǎo)時(shí)間狀語(yǔ)從句；    until 直到，引導(dǎo)時(shí)間狀語(yǔ)從句；once一旦，引導(dǎo)條件狀語(yǔ)從句。根據(jù)句意前后是條件與結(jié)果的關(guān)系，因此用連詞once來(lái)引導(dǎo)。故選D。
          考點(diǎn)：
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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