Sorry for not replying to your message on time. I was busy receiving a customer who is visiting our factory these days.个人感觉,加上because 太生硬了,不如拆成两个句子
I'm sorry so late reply to you,
because I this
several days busy
with a
customer to
visit our
factory
i beg your pardon that i received a client who came here to visit our factory these days that i rewrite so late.
I'm sorry to reply you so late, because I was busy to reception a customer which visit our factory these several days
仅供参考:I am sorry for replying you late, as I have been busy showing a customer around our factories.