单选题 Dorothy was always speaking highly of her role in the play, ______, of course, made the others unhappy.
A. who B. which C. this D. what

【正确答案】 B
【答案解析】[解析] 本题考查的是which引导的非限定性定语从句。which引导的非限定性定语从句来说明前面整个句子的情况。