( )-What’s that in the tree, can you see? -There must some birds in it. A. are; sitting ——青夏教育精英家教网—

摘要：( )-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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--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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