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          We were about to go outing _____ it began to snow heavily. 

          A. when 
          B. while 
          C. as 
          D. until 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				A				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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