Make marks you have questions.A. whichB. in whichC. whereD. in where

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A. which
B. in which
(答案→)C. where
D. in where
解析：考查状语从句。句意：在有问题的地方做标记。根据句意可知，空白处表示地点，排除A；where前不加介词，排除D；in which在定语从句中相当于where，但这里不是定语从句，排除B，故选C。