I didn't have as good a journey as ____(预料)

问题描述:

I didn't have as good a journey as ____(预料)
横线上为什么填expected ,而不是 expecting. 这句话的主语不是 I 吗?不可以把这句当做as引导状语从句,省略主谓吗

这是因为省略才这样(更习惯), 我把完整句子写出来你就能看明白了.
I didn't have as good a journey as 【it had been】expected