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

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--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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