——that he hadn't replied my letter ,i asked my brother for advice.

问题描述:

——that he hadn't replied my letter ,i asked my brother for advice.
A.puzzled B.puzzling Cto puzzle Dpuzzle
为什么用puzzled
在这里puzzled是过去式还是过去分词

(I feel) puzzled that.
puzzled这里是过去分词作形容词 疑惑的