问题
选择题
---You _________to our Mom like that. It was awfully impolite.
---You are right. I must have been crazy at that moment.
A．mustn’t have talked
B．needn’t have talked
C．shouldn’t have talked
D．may not have talked
答案
答案：C
考察情态动词否定用法。mustn’t 禁止needn’t 不必shouldn’t 不应该 may not 不可以，根据题意，你不应该和我们的妈妈那样说话。这是非常不礼貌的。——选C。你说的对，那时候我肯定疯了。