选C 考查定语从句,先行词school表示地点,观察从句the president studied 主要成分完整,缺少地点状语,in which=where.即the president student "in the school".
D选项on which=when表示时间 故错
B选项,that为关系代词,不能充当状语,错
A选项,关系词为宾语时才可省略,错
选C 考查定语从句,先行词school表示地点,观察从句the president studied 主要成分完整,缺少地点状语,in which=where.即the president student "in the school".
D选项on which=when表示时间 故错
B选项,that为关系代词,不能充当状语,错
A选项,关系词为宾语时才可省略,错