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           We were swimming in the lake _______ suddenly it began to rain heavily.
          A． when B． whileC． untilD．before
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A 

          試題分析：考查連詞：句意：我們正在湖里游泳這時突然下雨了。當一個動作正在、已經(jīng)或即將發(fā)生時，突然出現(xiàn)了一個預料不到的動作，這個預料不到的動作要用并列連詞when引導，when的意思是“這時”，“就在這時”. B. while當…時候，表示“一段時間”，C.  until直到，D. before在…前面，答案為A.
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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