I had assumed him to be a Belgian.

我本以为他是比利时人。

《牛津词典》

More than twice my size, she seemed too solid and stout to be real, especially when compared to the skinny body of the boy I had assumed.

她的体形是我两倍有余，看起来那么坚固结实，特别是跟我所假扮的这个清瘦的男孩相比，简直不像真的。

youdao

I had assumed that all we knew of the Greeks was hearsay.

我曾认为我们所知的关于希腊的一切都不过是传说。

youdao

"I assumed the same thing had happened and on that basis I supported reluctantly the second Iraq war."

VOA: standard.2010.01.02

When my performance review was coming up, I outlined all of the tasks I had assumed.

FORBES: Want To Get A Raise? Consider These 6 Steps

It was clear that something had to give but I had assumed that something would be the chief executive of News International, Rebekah Brooks.

BBC: News of the World: Something had to give

Some of these positions I had assumed were already too oversold.

FORBES: Guarding Against Your Own Market Assumptions