In the Beginning" can modify the verb "taught" as easily as it can the verb "rose." It can either verb assume, just as Milton's angels can "either Sex assume."

最初“还可修饰动词“宣讲“,也可修饰动词“生出“，它可修饰任意一个动词，正如弥尔顿笔下的天使可以“化男作女“

耶鲁公开课 - 弥尔顿课程节选