这是当代美国历史上最重要的事件之一.this was _____ ______the most important _____in modern American history
问题描述：
这是当代美国历史上最重要的事件之一.
this was _____ ______the most important _____in modern American history
答
this was __one___ ___of___the most important __events___in modern American history