What's that in the tree,can you see?There must( ) some birds( ) i_英语解答

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

人气：373 ℃　时间：2019-10-23 11:42:58

解答

D
there must be表肯定的推测
sitting in it 现在分词短语作定语
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