这是高中的语法,叫虚拟语气,结构就是你写的结构,意思是：是该做.的时间了,但是还没有做,所以是假设的,是虚拟的,所以用这种结构,期中should可以省略,这个结构必须掌握啊.
英语句式时态分析?It is (about/high)time that + 从句（过去式）/should do.为何+
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