Sorry for replying(to you/your email) so late.请问replying后面加to you还是your letter呢?如果不加可以嘛,为Sorry for replying so late?

Sorry for replying(to you/your email) so late.请问replying后面加to you还是your letter呢?如果不加可以嘛,为Sorry for replying so late?
Sorry for replying(to you/your email) so late.
请问replying后面加to you还是your letter呢?
如果不加可以嘛,为Sorry for replying so late?

Sorry for replying(to you/your email) so late.请问replying后面加to you还是your letter呢?如果不加可以嘛,为Sorry for replying so late?
Sorry for replying so late?就可以了
加上其他的是画蛇添足

to you
Sorry for replying so late也对啊！

sorry for late reply

reply to 是固定搭配
sorry for replying so late也对啦