王老师:19139051760(拨打)复制微信 题目 更新时间:2023/4/3 He had worked so hard. He _______ in the exams.(本题5.0分) A、 must have B、 would have C、 could have failed D、 should not have failed 答案 登录 注册 标准答案:D 出自:青书学堂 >> 延安大学-大学英语Ⅲ 延安大学继续教育学院