出典:Tatoeba
I deeply apologize for my delay in getting back to you.
I am sorry for the late response.
I am terribly sorry that my reply is late.
I am terribly sorry for the delay in my reply.
I am terribly sorry for the delay in my reply.
I am terribly sorry for the late reply.
I am sorry that my reply was late.
I am terribly sorry for the late response.
I am terribly sorry for the delay in the reply.
I am terribly sorry for the delay in my reply.
I am terribly sorry about responding so late.
I'm very sorry for the late response.
I am sorry for not replying to you earlier.
I am sorry for not replying to you sooner.
I'm very sorry for the late reply.
I am terribly sorry about the late reply.
I'm very sorry for the late reply.
I'm sorry I didn't get back to you sooner. I've been snowed under at work lately.