问题
选择题
Mary was much kinder to Jack than she was to the others，______， of course, made all the others upset.(2011·北京)
A．who
B．which
C．what
D．that
答案
答案：B
B [考查非限定性定语从句。逗号后的非限定性定语从句中缺少主语，which引导非限制性定语从句，指代整个主句部分的内容。选择which。]