They were singing and dancing happy in the hall.改为感叹句
问题描述：
They were singing and dancing happy in the hall.改为感叹句
答
They were singing and dancing happily in the hall.改为感叹句
How happily they were singing and dancing in the hall !
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答
应该是happily ,用副词修饰动词 sing ,dance.
How happily they were singing and dancing in the hall !