I must say that rather shocked me, too.

我得说那件事也让我颇为震惊。

《柯林斯英汉双解大词典》

I must say that you have good taste.

我说呀，你真有眼光。

《新英汉大辞典》

I must say that I am very much to blame.

我必须说都怪我不好。

《新英汉大辞典》

"How he is kicking and all that stuff and I do everything what they say I must do.

VOA: standard.2010.07.01

Now, I don't know how far back it goes but it must be that in ancient times some people would say, all right you're going to be doing more work or you're contributing more to this enterprise, we'll give you a bigger share of the profits.

我不知道这能追溯到什么时候,但在古时候肯定有人说,好吧,你比别人干得多,你对公司的贡献更大,我们会把收入的大头给你

耶鲁公开课 - 金融市场课程节选

However, I must say that the title of this article has deeply disturbed me.

FORBES: Tata's Revelation Highlights India's Culture Of Corruption

But I must say that while strong opinions are rewarded on the Internet, so is thick skin.

FORBES: 'Super Rich' Law Professor Retires From Blogging After 'Electronic Lynch Mob' Attacks His Position on Taxes

Before I go further on President Obama, I must say that Congress shares in the blame for this paralysis (but not the false optimism).

FORBES: America In Paralysis & False Optimism