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    29．--What's that in the tree.can you see? --There must some birds in it． A．are,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．are；sitting            B．be；sit             C．have；sitting           D．be；sitting

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