She is ______the brightest star of British ballet.

She is ______the brightest star of British ballet.
A、normally
B、upsettingly
C、undoubtedly
D、unnecessarily
【正确答案】：C
【题目解析】：句意为：她无疑是英国芭蕾舞团最耀眼的明星。undoubtedly 无疑，必定；normally 正常地；upsettingly 混乱的，沮丧的；unnecessarily 不必要的。