问题 更新时间2023/4/3 12:59:00 78. Peter was about to unlock the door _______ he found someone had broken into the room.A. once C. than B. before D. when 答案 登录 注册 答D 出自:青书学堂 >> 新疆师范大学2021级学生第一学期结业课程考试《大学英语》