真抱歉，我回的很慢。 用英语怎么说？

I'm sorry that I reply too slowly.

I am sorry for my delayed reply. 不知道我回的很慢什么意思。
或者I am sorry that I will come back very late.

I'm awfully sorry for my delayed response.

如果是信函的话：Sorry for my late reply.
特别外贸信函，该简就简

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very sorry, i late reply .