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。
I have to delay answering the letter.
我只得推迟复信。
Thank you for calling our office. We are experiencing very high call volume at this time and apologize for the delay in answering your call.
感谢您致电我们的办公室。此时我们正接受非常高的电话呼叫量，为此迟复为歉。
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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