问题补充：
Having arrived at the railway station, .
A. it was found that the train had left
B. the train had left
C. the train was found left
D. he found that the train had left
答案：
A. it was found that the train had left
B. the train had left
C. the train was found left
(答案→)D. he found that the train had left
解析：考查分词作状语。题中已经用现在分词作状语，故其逻辑主语必须为人，只有D选项符合。
