Find something around you which is a circle. 请问这个句子正确的吗?

题目

Find something around you which is a circle. 请问这个句子正确的吗?

答案

不正确,which应改成that .
原句中 which is a circle是定语从句,修饰something.
但是,当先行词为something,anything ,nothing ,everything等不定代词时,
定语从句要用that 引导,不能用 which.