---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 talkedB.needn’t have talkedC.shouldn’t have talkedD.may not have talked
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C解析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。