sar雷达原理:It is high time that .....后面加过去式 还是should加原型？

It is time(high time)that . It is high time... It is high time that .....后面加过去式 还是should加原型？ Obviously, it is high time that we took some measures to solve the What it is that always behind time?(谜语) 翻译一句话It's high time that something were done upon it . The _____ of the camera is too high, but i'm sure that it is worth all that money What is it that everyone in the world is doing at the same time? What time is it? 连词成句：time/that/of/it/year/is again