王老师:19139051760(拨打)复制微信 题目 更新时间:2023/12/31 _____ scores of times ,but he still couldn’t understand it .·A Having explained ·B Having beeexplained ·C Though it was explained ·D It was explained 答案 登录 注册 单选题·D It was explained 出自:青书学堂 >> 延安大学PowerPoint 图文演示技术 延安大学继续教育学院