What's that in the tree,can you see?There must( ) some birds( ) in itA,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 itA,are;sitting B be;sit C have;sitting D.be;sitting

What's that in the tree,can you see?There must( ) some birds( ) in itA,are;sitting B be;sit C have;sitting D.be;sitting
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

What's that in the tree,can you see?There must( ) some birds( ) in itA,are;sitting B be;sit C have;sitting D.be;sitting
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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A 这是There be固定结构
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c情态动词家完成时

D