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				29．The farmers           on the  farm when a UFO flew over their heads．A．worked        B．work          C．a(chǎn)re  working      D．were working			【查看更多】
			


		
     
    


		
    
		
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    The farmers _________ on the farm when a UFO flew over their heads．
      
    A．worked                B．work             C．a(chǎn)re working               D．were working
    

			
    
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