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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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