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				 Mother dogs have several babies           .  A.  on a time      B. in a time    C. at a  time     D. for a time			【查看更多】
			


		
           
          


		
          
		
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          Mother dogs have several babies __________.
            
          A. on a time         B. in a time       C. at a time       D. for a time
          

			
          
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