请问It's high time that measures were taken to solve the problem of traffic jams.这句话这句话中为什么要用were taken啊?

请问it's high time 的用法 It's high time...的用法 it's high time的用法? It’s (about/high)time+that: it's high time that怎么翻译 英语：it's high time是什么意思?详细! it's high time that the fighting It is high time It is high time it's high time that sb were还是was It's high time that he stopped smoking?翻译 It's high time for sb.to do sth. Dear,it's high time thati forget you it's high time you__(give)up smoking. It' s time that和 It‘s high time that 区别? it is high time的high是什么意思 it is high time that . 请问It's high time that measures were taken to solve the problem of traffic jams.这句话这句话中为什么要用were taken啊?