upon which 理解疑惑？

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）可以转换成例如, 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= and upon their doing so. 介词upon/on+动名词，为时间状语，意为，刚一...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。

曹荣禄 -

擅长：动词用法,句法问题 | 采纳率 82% | 回答于 1秒前

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