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
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
答案：B解析：of course为插入语，which代指前面整个句子的内容，在从句中作made的主语。句意：“玛丽对待杰克要比她对待其他人好得多，当然，这让其他的所有人很不舒服。”who不指代整个句子的内容，what不引导定语从句，that不引导非限制性定语从句，故选B项。