王老师:19139051760(拨打)复制微信 题目 更新时间:2023/4/3 7. The opening ceremony is a great occasion. It is essential ____for that. A. for us to be prepared B. that we are prepared C. of us to be prepared D. our being prepared 答案 登录 注册 A 出自: >> 继续教育学院