13、--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
13、D
科目：初中英語 來源： 題型：
--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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