We apologize for the delay in answering your letter.
来信收悉，迟复为歉。
I've written him a letter to apologize and hope he'll forgive me.
我已经给他写了一封信，向他道歉，希望他能原谅我。
I must apologize for not answering your letter in time.
我为我延误回信向您道歉。
Let me apologize for my being tardy in answering your letter.
让我为我的迟迟回信道歉。
I must apologize for not replying to your letter.
我没有给你回信向你道歉。
I must apologize for not replying to your letter.
我没有给你回信向你道歉。
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