急，英语翻译： 抱歉这么晚回复你，因为我这几天忙着接待一个客户来我们工厂参观

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.