he is my good friend.i am sure that he ___ ill of me that day.

问题描述:

he is my good friend.i am sure that he ___ ill of me that day.
A couldn't have spoken
B mightn't have spoken
C must have spoken
D couldn't have to help
为什么?还有就是句意是什么?

选A.意思是,他是我的好朋友,我很确定那天他不可能说我坏话