I'm very sorry for I have replied to your letter for a long time, because I was very busy recently.

非常对不起，那末久没给你回信。我这段比较忙。

youdao

I'm very sorry for I have replied to your letter for a long time, because I was very busy recently.

非常对不起，那末久没给你回信。我这段比较忙。

youdao