He was happy to catch sight of an eagle flying in the sky为什么要加to

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He was happy to catch sight of an eagle flying in the sky为什么要加to
He was happy to catch sight of an eagle flying in the sky为什么要加to

He was happy to catch sight of an eagle flying in the sky为什么要加to
be happy to do sth.
固定用法

be happy to do 固定搭配

这个不是固定搭配,在这里to 表示目的