Policymakers turned their focus to public education as a matter of national security, one too important to entrust to educators.政策拟定者随后将关注点转向公共教育范围。在政策拟定者看来，公共教育已上升至国家安全的高度，其重要程度（或高盈利性）完全没办法让政策拟定者将进步公共教育的任务放心交予教育部门。
各位老师好。这是网上看到的“2019年6月CATTI二笔实务考试真题”中的一段。请问as a matter of national security是 public education 的后置定语吗？one是引导非限定性定语从句，并且指代前面一句话吗？ turned their focus to public education中的to public education是宾补还是方向状语？
1 as a matter of national security是 public education 的后置定语。2 one在此是名词替代词，替代a matter. one tooimportant to entrust to educators 为名词短语，作a matter of national security的同位语。这里哪有定语从句？3 to介词短语修饰turned为状语，不是宾补。
