I am sorry I haven't written for such a long time, but I've been very busy lately as my partner has been away and I have had to do his work as well as my own.

对不起，这么长时间没有给你写信了。因为我的合作者外出，我近来一直很忙，既要做他的工作又要做自己的工作。

youdao

I am sorry I haven't written for such a long time, but I've been very busy lately as my partner has been away and I have had to do his work as well as my own.

对不起，这么长时间没有给你写信了。因为我的合作者外出，我近来一直很忙，既要做他的工作又要做自己的工作。

youdao