we have received your enquiry of 15 october_in which_ you advise us of your interest in cashmere.

来源：百度知道 编辑：UC知道 时间：2024/06/23 01:52:22
此句为什么要选in which?
we have received your letter of septembe 12,_____ we are glad to know that you are interested in our electric heaters. ( which at which in which from which）要选哪个答案呢？

in which 是一个非限制性定语从句的用法,具体是指in your enquiry,in which在此处做状语.你的这个句子有点像商业用语.
第二个句子我个人认为要选from which,具体是指from your letter,也是充当状语的成份.而且这个句子也有点像商业用语.
是吗?

in which=where(在什么地方)

我们在十月15号收到你的询价信,在信里你告知我们……