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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 【查看更多】

     

    题目列表(包括答案和解析)

    --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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