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
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
B
of course 为插入语，若将项其去掉，则答案显然是B。