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

问题描述:

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

When you read the book,you'd better make a mark at the spot _____ you have any questions.
A.at which B.at where C.the place where D.where
选D
where引导一个定语从句