it was high time that 后面加什么

It is (high) time that表示“是该做......的时候了；

后面的从句谓语动词要用过去式或用should加动词原形，但should不可省略；

例句

It is high time that we should tell him the truth.

是我们该告诉他真相的时候了。

It\'s the fifth time that I\'ve been to America.

这是我第五次去美国了。

Is this the first time that you\'ve flown?

这是你第一次乘飞机吗？

It\'s not the first time that you\'ve found yourself in this situation

你陷入这种状况已经不是第一次了。

Isn\'t it about time that you pulled your finger out?

现在到了你该赶紧动起来的时候了吧？

It had been known for some time that chemical reactions can be catalyzed by materials with large surface areas

人们早已知道，如果材料的表面积足够大，可引起催化反应。