once our friends sTOPped and stared into a shop window, upon which Holmes did the same.
这里的upon which Holmes did the same - 福尔摩斯也学着他们的样儿(=也那样做了)。
请教老师,
1)这里的介词 upon = on 是 “关于“ 的意思吗?
2)可以转换成比如, as Holmes did the same. 吗?
once our friends sTOPped and stared into a shop window, upon which Holmes did the same.
which指代主句的内容,作介词upon/on的宾语。upon which= andupon their doing so. 介词upon/on+动名词,为时间状语,意为,刚1、..就...。即他们停下来看商店橱窗,福尔摩斯也跟着停下来做同样的事。