语法总结
过去完成时作背景交代
had been specially built / had been 299 miles per hour 都帮助区分先后信息。
相似句：
- The bridge had been built before the war began.
- She had already left when I arrived.
Although 引导让步
Although he reached... he had great difficulty... 用来写“成绩亮眼，但过程惊险”。
相似句：
- Although he was tired, he kept working.
- Although the road was long, we reached the town.
Following ... 作伴随/方式补充
Following in his father's footsteps... 用现在分词短语概括 Donald 的选择。
相似句：
- Following his teacher's advice, he changed the plan.
- Walking slowly, she crossed the room.