When you read this paper,you’d better make a mark______you have questions.

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问题 When you read this paper,you’d better make a mark______you have questions.

选项 A、at which   
B、at where
C、the place where
D、where

答案D

解析  where在此意为“在……的地方”,用以引导地点状语从句,全句意为:当你读这份文件时,最好在有问题的地方作一个记号。
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