【单选题】It was not until recently ( ) we learned the famous film star would marry that politician.
【单选题】It was not until an hour later that we heard ______ what had happened.
【判断题】行动研究中计划环节三步骤是1.发现并分析存在的问题 2.提出解决问题的假设 3.制定行动方案
【判断题】艾滋病是一种危害大、 死亡率高的严重传染病,目前尚不可治愈。