单选题 They showed us around the factory ______ is equipped with modern machines.
A. in that B. what C. in Which D. which

【正确答案】 D
【答案解析】[解析] 本题考查定语从句中关系词的用法题。which在此处引导一个限制性定语从句修饰先行词the factory，并在从句中做主语。