Do you know what _____when the police came yesterday为什么填did happen?

问题描述:

Do you know what _____when the police came yesterday
为什么填did happen?

答案错了吧,感觉应该是 happened

did happen中的did是加强语气
如: A two-day visit to * cst him 3,600 yuan ,but he does think it is worth the money.中的does think一样的用法