区别地点状语从句和WHERE引导的定语从句

题目

区别地点状语从句和WHERE引导的定语从句
When you read the book ,you 'd better make a mark_________you have any question.
A at which B at where C the place where D where
请问 这是一个定语从句,还是状语从句呢,怎么去区别
如果是定语从句,A 也可以啊

答案

You'd better make a mark where you have any questions.
You`d better make a mark at the place where you have any questions.
以上两句字意思相同,但第一个是状语从句,后一个是定语从句.定语从句有先行词THE PLACE,而状语从句没有.状语从句中where引导的句子做地点状语,不出现place.
定语从句出现先行词place,再用where引导的定语来修饰place