historyisarecordofwhathappenedinthepast.空格处应该填had还是has?为什么?

Question

history is a record of what ___ happened in the past. 空格处应该填 had 还是 has?为什么?

Answer 1

是 has.因为主句用了一般现在时态,就是截止到现在为止的时间以前；而had happened是截止到过去的一个时间点以前完成的动作. in the past = before在以前：
Employers are seeking people who can contribute and have successfully performed in the past .
Officials have in the past tried to limit exports through punitive taxation or quotas .