青云翻译

I'm sorry I've been busy, and now only give you a reply.

I'm sorry I've been very busy, until now to answer your letter.

Is unfair to me to be continuously very busy, only then gives you to the present to reply in writing.

I am sorry I have been very busy, and only now is to give you an answer.

I'm sorry I've been very busy, until now to answer your letter.