mustn’t, shouldn’t, wouldn’t; and, but, otherwisePeter ______hav

mustn’t, shouldn’t, wouldn’t; and, but, otherwise
Peter ______have received my message; ______he would have telephoned me.
【正确答案】：shouldn’t /otherwise
【题目解析】：Should+ 完成式表示说话者对过去事物状态假设的信心。