What a surprise it is that you've hiked on Mound Tai!I didnt believe I could do it I got to thetop got 前为什么填after而不填unless

What a surprise it is that you've hiked on Mound Tai!I didnt believe I could do it I got to thetop got 前为什么填after而不填unless
What a surprise it is that you've hiked on Mound Tai!I didnt believe I could do it I got to the
top got 前为什么填after而不填unless

What a surprise it is that you've hiked on Mound Tai!I didnt believe I could do it I got to thetop got 前为什么填after而不填unless
unless 是除非,只用于未发生的事,这事明显已经发生了,所以不适合填
What a surprise it is that you've hiked on Mound Tai!I didnt believe I could do it (even) after I got to the top.
感觉上应该还有一个even,句子就比较通
真想不到你登上了泰山!我直到上了山顶也还不敢相信自己能做到呢.

我觉得是该填unless

after：之后
I didnt believe I could do it after I got to the top
在我登上之顶后，我还不相信（那是真的）。
单从选择上都没错，但是前面有个surprise（惊讶），用后者，难以相信比较符合语境吧

二楼是的