I think it is you rather than the student who for being late for the speech.
A. is to blame
B. are to blame
C. is to be blamed
D. are to be blamed
网友回答
A. is to blame
(答案→)B. are to blame
C. is to be blamed
D. are to be blamed
解析：考查blame表示该受责备固定及主谓语的一致性的用法。Be to blame为固定用语；定语从句修饰的是you 而不是student,要注意主谓语的一致性。