Dorothy was always speaking highly of her role in the play, ,of course , made the others unhappy.
A. which
B. who
C. this
D. what
网友回答
(答案→)A. which
B. who
C. this
D. what
解析：考查定语从句。在定语从句中which指代一句话的内容在句中做主语，引导非限制性定语从句。句意：Dorothy总是高度表扬自己在戏剧中的作用，这件事情大人让其他人不高兴了。故A正确。