说明
the deepest hole to be bored
核心问题
The deepest hole ever to be bored on land went down 25,340 feet — considerably less than the height of Mount Everest. (New Concept English, Book 3, L. 47)
据我所知，动词不定式作定语时，表示将来要发生的动作。在上面的句子里却似乎是
表示已完成的动作,这是怎么回事呢?
词典解答
the + 形容词最高级 + 名词与 the first, the last + 名词有相同之处, 见 first (the first to be held)。