您要查找的是不是：
- When did the symptom begin? 症状是什么时候开始的?
- When did the symptom begin ? 症状是什么时候开始的?
- When did the empire begin to wane? 那个帝国何时开始衰落的?
- When do the new safety rules come into force? 新的安全规则何时生效?
- When did the Civil War begin and when did it end? 美国内战何时开始,何时结束?
- When did the world come into being? 世界是什么时候形成的？
- When did the universe come into being? 宇宙最初是何时形成的?
- Annie: When did the Asian Games begin? 安妮: 亚运会是从什么时候开始的呢?
- Annie: When did the Paralytics begin? 安妮：残奥会是从什么时候开始的呢?
- When did the soccer begin to play as a match? 英式足球什么时候开始成为一项比赛的?
- When do the new semester start< begin>? 新学期何时开学?
- When did the first measurement of the speed of sound take? 第一次测量声速是在什么时候？
- When does the new law come into operation? 这项新法律何时生效？
- How does the symptom of hepatitis see. 肝炎的症状怎么看出来啊。
- When does the birthday party take place? 生日庆祝会什么时候举行？
- When does the new system become effective? 新制度何时生效？
- When did the miniskirt go out of vogue? 迷你裙是何时不流行的?
- When does the express train leave? 特别快车什么时候开?
- When did the Olympic Torch Relay begin? 奥运火炬传递从什么时候开始?
- What does the symptom after philtrum heat have? 人中暑之后的症状有哪些?
