We apologize for the delay in answering your letter.
来信收悉，迟复为歉。
Excuse me for my delay in answering your question.
请原谅我耽搁了回答你的问题。
Excuse us for delay in answering your letter.
原谅我方没有及时回信。
That is the reason of my delay in answering your letter.
这就是我迟迟不给你复信的缘故。
That is the reason of my delay in answering your letter.
这就是我迟迟不给你复信的缘故。
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