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				24．        a cold morning, I opened the door and was happy to find that it was  snowing outside．A．By          B．In          C．At          D．On			【查看更多】
			


		
           
          


		
          
		
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          _______ a cold morning, I opened the door and was happy to find that it was snowing outside．
            
          A．By               B．In                C．At                D．On
          

			
          
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