When you read the book you’d better

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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

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  • 答案:

    D

    解析:

    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。