同学你好，该知识点来自沪江网校《新概念英语2、3、4册连读【外教VIP 全额奖学金班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
However, he had at last been allowed to send
a fax 先行词 in which he informed the editor定语从句
宾语从句 that the he had been arrested
状语从句while counting the 1,084 steps leading to the fifteen-foot wall
the fifteen-foot wall 先行词 which surrounded the president's palace. 定语从句

祝同学学习进步~