【题目】 Mary was much kinder to Jack than she was to the others, _______, of course, made all the others upset.
A. who B. which C. what D. that
在线课程【答案】B
【解析】
试题分析：考查非限制性定语从句。本题定语从句中关系代词which指代前面一句话的内容，在句中作主语。句意：Mary对Jack要比对其他人更好，这一点当然让其他人不 开心。关系代词that不能引导非限制性定语从句。C项不能引导定语从句，who的先行词要是指人的名词。故B正确。