You never know how strong you really are until being strong is the only choice you have 求语法详解
问题描述：
You never know how strong you really are until being strong is the only choice you have 求语法详解
答
You 主语never副词作状语know谓语how strong.宾语从句在宾语从句中how strong...是一个感叹句形式的宾语从句how strong在宾语从句中与are构成系表结构really程度副词修饰stronguntil 时间状语从句being strong时间状...