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				39．Peter is busy            at school.but he never forgets           exercise every day．A．working,doing   B．working,to do    C．a(chǎn)t work,doing			【查看更多】
			


		
           
          


		
          
		
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          Peter is busy _________ at school，but he never forgets _________ exercise every day．
            
          A．working；doing           B．working；to do           C．a(chǎn)t work；doing
          

			
          
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