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           – How long have you been collecting stamps?
          –         I was ten years old.
          A. Since                        B. When                 C. Because
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A

          試題分析：A. Since自從，B. When當(dāng)，C. Because 因為，句意：你收集郵票有多長時間了？自從我十歲開始。故選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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