老师说,only to do sth 是一个比较特殊的不定式结构,只用于表示一种意想不到的结果。如:He hurried to the house only to find that it was empty. 他急忙赶到那所房子,却发现空无一人。He returned after the war, only to be told that his wife had left him....
Of all the changes, the most far-reaching has been the inexorable
decline.
请问老师,这句话 the most far-reaching作主语,省略了changes,这个changes是必须省的吗?可以加回来吗?还是说这个省略代表了什么语法知识呢?