填空题 Almost exactly a century {{U}}before{{/U}}, a meeting of the European states at the Congress of Vienna {{U}}has established{{/U}} an international order and balance of power that {{U}}lasted for{{/U}} almost a century. By 1914, however, a multitude of forces were threatening {{U}}to tear it apart{{/U}}. A. before B. has established C. lasted for D. to tear it apart