Question

it was high time that从句中用什么时态

Answer 1

it was high time that从句中用什么时态
通常是用过去完成时态。
理由：
It's (high, about) time that 句型中，that从句中要求用虚拟语气，从句的谓语动词用过去式表示与现状事实相反，用过去完成时表示与过去事实想反；主句是过去时态，从句只能是对过去的事实，故用过去完成时态。
如：
It is high time that we put an end to this discussion.
现在是我们该结束讲座的时候了。
It was time that something had been done about the traffic problem downtown. 城里的交通问题早改采取一些措施了。