Please accept our apology for the delay in replying to your lett

Please accept our apology for the delay in replying to your letter June 8. It took us a month to collect the data necessary to answer your questions.
【正确答案】：迟迟未回复您 6 月 8 日的信,请接受我们的道歉。 我们利用一个月的时间收集必需的资料,来回复您的问题。