When you read the book,you’d better make a mark _____ you ha

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When you read the book,you’d better make a mark _____ you have any questions.A.where B.at where
选A是状语从句.选B正确吗?
B选项可不可以理解为at后面是宾语从句缺少地点状语所以构成at where 这个结构，这样理解正确吗？

选A;Where 引导的地点状语从句.at 后面可以跟宾语从句但是where不行.如果加上at可以改成 at a/the place where where 在这儿引导的定语从句.place 做了at的宾语.

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