It is a truly delightful place, which looks the same as it must have done 100 years ago with its winding streets and pretty cottages.

这真是一个令人愉快的地方，它一百年前一定和现在看起来一样，有蜿蜒的街道和漂亮的小屋。

youdao

He said I must have done something bad to deserve it.

他说我肯定是罪有应得。

《牛津词典》

He must have done a good job.

他一定做得很好。

youdao

But they surely must have done it before too.

但是之前也肯定有过阴谋诡计

耶鲁公开课 - 古希腊历史简介课程节选

They must have done-- but they didn't win.

他们肯定已经,但是他们不是赢家

耶鲁公开课 - 博弈论课程节选

This chart made me buy cupcakes (marketers, take note) so it must have done something right.

FORBES: The Anatomy of A Recipe

In the BNSF boardroom Buffett must have done an excellent job of taking fear off the table.

FORBES: How to Hunt Elephant Deals Like Buffett

But British banks must have done something right that such a catastrophe wouldn't eliminate 100% of their capital.

BBC: Why UK banks are not immune to eurozone woes