楼主没有说清楚是对哪个部分划线提问.
1. 如果是对David划线提问,答案：Who was in the police station yesterday morning?
2. 如果是对in the police station划线提问,答案：Where was David yesterday morning?
3. 如果是对yesterday morning划线提问,答案：When was David in the police station?