问题
选择题
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
答案
答案：D
题目分析：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。
搜题请搜索小程序“爱下问搜题”