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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