“我很吃惊，我没有想到他可以这么快适应下来。”这句话英语怎么翻译？

I am surprised that he can get used to that so soon.

I'm so surprised that he's been ajusted so rapidly.

I'm very surprised, it never occured to me that he could get used to that so quickly!

我没有想到....这是一个固定句型，it didn't/never occure to me...

I'm surprised, never did I think he could adapt so quickly.

“我很吃惊，我没有想到他可以这么快适应下来。”

I'm so surprised that he adapted so well and quickly.

我很吃惊，我没有想到他可以这么快适应下来。

it's to my astonishment that he adapted so soon to it.
it's out of my expectation that he adapted so quickly to it.