楼主要注意答句中存在着主从复合句,且主句时态为一般过去时。
按照楼主的理解,选B的话则句意不通顺:我(当初)预计它再好不过了?或:我(当初)没有预料它会(比现在我感觉的要)更好?
答案选A,此时从句存在省略,即:
I didn't expect it was as wonderful.
= I didn't expect it was as wonderful (as it is).
我当初没有预计到它和现在(我感觉的)那般好。
as 这里是与自己之前的想象或预料的进行对比
这里的 not as 表示的是比想象当中要好。