Having lost 肯定不对.因为至少是he was lost in thought.但即使是变为Having been lost也应该选Ｂ，应为用完成时的话说明这两个动作发生有先后，先陷入沉思这个动作结束后再撞上（通吗？）所以说选Ｂ表示一种状态．
B.lost 是过去分词做状语原句是：As /Because he was lost in though, he almost run down by a bike.因为主句的主语是he，从句的主语也是he，谓语是be ,在状语从句中，主句的主语与从句的主语相同，而从句的谓语是be ，就可以省略从句的主语和谓语． lost in thought 陷入沉思
lost 是形容词做状语．原句是：As he was lost in though, he almost run down by a bike. 省略为：lost in thought,....
填lost lost是过去分词.lost in thought作原因状语,相当于:Because he was lost in thought, he almost ran into the car in front of him. 意思是:由于他思想开小差了，差点撞到前面的车. 另: lost in thought 有时译作:"陷入沉思"
答：这句话你可以这样理解 He lost in thought and almost ran into the car in front of him. 这样你还会...详情>>
答：B 被动语态，be found to do. A中的made与found均为过去分词，冲突！详情>>
问：hArd work 和hArd--working有什么区别
答：一个是名词 一个是形容词撒详情>>
