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          All the photographs in this book,     stated otherwise, date from the 1950s.
          A．unlessB．untilC．onceD．if
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A

          試題分析：句意：除非另有說明，所有的圖片始于19世紀(jì)50年代。由此可知，空白處應(yīng)該使用A選項引導(dǎo)條件狀語從句。在這一從句中，省略了主語和be動詞。因此，正確答案為A選項，選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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