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				29．--What's  that in the tree.can you see?--There must           some birds           in it．A．a(chǎn)re,sitting      B．be,sit          C．have,sitting       D．be,sitting			【查看更多】
			


		
           
          


		
          
		
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          --What's that in the tree，can you see?
            
          --There must _________ some birds _________ in it．
            
          A．a(chǎn)re；sitting            B．be；sit             C．have；sitting           D．be；sitting
          

			
          
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