No sooner had I sat down than there was a loud knock on the door.

我刚坐下就有人大声敲门。

《牛津词典》

In that very instant, a loud knock sounded on the door.

就在这一刹那，有人在敲门。

youdao

In that very instant, a loud knock sounded on the door.

就在这一刹那，有人在敲门。

youdao