You’d better make a mark you have any questions.A. at whichB. at whereC. the placeD. whe

问题补充：

You’d better make a mark you have any questions.

A. at which

B. at where

C. the place

D. where

答案：

A. at which

B. at where

C. the place

(答案→)D. where

解析：where引导的地点状语从句。