20. When you read the book, you' d better make a mark _____ you have any questions.

来源：百度知道编辑：UC知道时间：2024/09/24 12:22:23

20. When you read the book, you' d better make a mark _____ you have any questions.
A. at which B. at where C. the place D. where

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。定语从句不管是where还是which要有先行词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
所以选D

正确答案是:D
When you read the book, you'd better make a mark where you have any question.

where = in which place 地点状语从句

D. where=====at the place where

A
在有问题的的地方做记号

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