For it was only then that 这是什么结构用法?求分析 谢谢Only after grappling with German literature, teaching in Vermont and Pennsylvania schools, pursuing graduate study in Boston, and engaging the ancient Chinese texts for the first time

For it was only then that 这是什么结构用法?求分析 谢谢Only after grappling with German literature, teaching in Vermont and Pennsylvania schools, pursuing graduate study in Boston, and engaging the ancient Chinese texts for the first time
For it was only then that 这是什么结构用法?求分析 谢谢
Only after grappling with German literature, teaching in Vermont and Pennsylvania schools, pursuing graduate study in Boston, and engaging the ancient Chinese texts for the first time, was she finally able to appreciate the Confucian influences on her own development. For it was only then that she realized Confucianism was able to exert its lasting influence on China not because of Maoism, but despite it.
意思我知道 我想知道这种结构怎么理解

For it was only then that 这是什么结构用法?求分析 谢谢Only after grappling with German literature, teaching in Vermont and Pennsylvania schools, pursuing graduate study in Boston, and engaging the ancient Chinese texts for the first time
直到那时（她才意识到）,接原因状语从句
it is only when/then...that...是对中间 ”时间“ 的强调句.
it is +人、时间、谓语动词、地点+that 是强调句结构.