have a case on

例句：

1. 1. We need to have a case on the new policy immediately.
   我们需要立即对新政策进行调查。
2. 2. The police have a case on the murder.
   警方有谋杀案在手。
3. 3. He has a case against the company for unfair competition.
   他因为不公平竞争对这家公司提起诉讼。