I regret deeply that....
我深感抱歉 I'm really sorry about it ; I am deeply sorry
对此我们深感抱歉 We are sorry
对于给您带来的不便，我深感抱歉。
I'm terribly sorry for the inconvenience.
youdao
对造成的不便和麻烦，我深感抱歉。
I apologized for any inconvenience to you.
发生这种错误很不应该，我们深感抱歉。
This shouldn't have happened, and we're sorry it did.
You are sorry for that.
如果确实是的话，深感抱歉。
I'm sorry 课堂 - SpeakingMax英语口语达人
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