语法总结
as 引导原因从句
As we had had a long walk... 说明停下来休息的原因，had had 表示更早的经历。
相似句：
- As it was late, we went home.
- As she was tired, she sat down.
continue doing
continued to dance / continued dancing 都表示继续做某事。
相似句：
- He continued working.
- She continued to speak.