--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
科目:初中英语 来源: 题型:
--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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