Question

1. Don’t talk about such things of _______ you are not sure.

A. which B. what C. as D. those
请问这个题目为什么选a呢？麻烦把语法知识点也详细讲一下哈。。。

Answer 1

of which 是固定搭配
意思相当于 that

Don’t talk about such things of which you are not sure.
就相当于

Don’t talk about such things that you are not sure.

Answer 2

选A。of which引导定语从句，介词of是与定语从句中的形容词sure搭配的。

Answer 3

of which you are not sure = sth. you are not sure.
然后sth. 就是 such thing 了。
分成2分句的话 在things of中间
分成2句来理解