It was the third time that I of the changes of the timetable.
A. had informed
B. have informed
C. had been informed
D. have been informed
网友回答
A. had informed
B. have informed
(答案→)C. had been informed
D. have been informed
解析：句意：这是我第三次被通知时间表的改变。这句话用了It was +序数词+that sb had done sth “这是某人第几次做某事”，如果是It is+序数词+that sb 后面接现在完成时，而且I和inform是被动关系，用过去完成时的被动，选C。