Question

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

Answer 1

D

解析试题分析：句意：当你看书时，最好在你有问题的地方做个标记。where在这里引导地点状语从句。故选D。
考点：考查地点状语从句。