Your teacher very angry at that moment because you talked back to her like that.
A. should have been
B. must have been
C. must be
D. might have been
网友回答
A. should have been
(答案→)B. must have been
C. must be
D. might have been
解析：B 考察情态动词。由语境可知。你那样对老师说话。想必他一定很生气。Should have done过去本应该做某事…实际上却未做；,must have done一定做了某事；might have done也许已经…；根据at the moment和talked可知此处是对过去事情的猜测，排除C项。由语境可知B正确。