whoosis

例句：

1. 1. Who is to blame for the accident?
   谁应该为这场事故负责？
2. 2. The mystery of who killed him remains unsolved.
   他被杀的谜团尚未解开。
3. 3. The police are trying to find out who is responsible for the fire.
   警方正在试图找出谁应对火灾负责。