定语从句

We will strengthen ongoing and ex post oversight of items for which approval has been cancelled or delegated to lower-level authorities.

老师①这句话的for which中的for是怎么出来的呢？②用of可以吗？为什么？

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1 个回答

刘三木 2021-09-29 10:42

for which.....，后面是个定语从句，介词+关系代词结构，for表原因，which指代先行词post oversight of items，不能用of，of不能表原因。