问题描述：
What’s in that tree?——There are some birds in that tree.
What’s in that tree?
——There are some birds in that tree.
----------------------
A lt's a bird B There are some birds C They are birds
为什么选B....说清楚···
What’s in that tree?
——There are some birds in that tree.
----------------------
A lt's a bird B There are some birds C They are birds
为什么选B....说清楚···
问题解答：
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