我有一个道歉要向您作出——恐怕我误开了您的信。

I have an ___apology to make to you - I'm afraid I opened your letter by mistake.

克里斯，我欠你一个道歉。

I owe you an ___apology, Chris.

嗨，Zita，请接受我为这封你手中迟到的信件道歉。

Hi Zita, Please accept my ___apology for this belated letter which you're holding in your hands.