语法总结
过去完成被动与完成式结构
had been asked / After having been instructed... 都在考试叙事里帮助区分“先被要求”再“开始考试感受”。
相似句：
- He had been told to wait outside.
- After having been warned, she drove more carefully.
must have been 表过去推测
The examiner must have been pleased... 表示作者当时根据主考官笑了这一迹象作出的推测。
相似句：
- He must have forgotten the meeting.
- They must have been shocked by the news.
Sure that ... 作状语
Sure that I had passed... 把作者的心理状态浓缩成一句，后面的失败因此更有反差。
相似句：
- Sure that she was right, she spoke confidently.
- Certain that he would win, he relaxed too early.