so far出现的句子用什么时态

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• 英语语法疑问It is high time +一般过去时,作为虚拟语气.那么,it was high time 后面用一般过去时还是过去完成时?It was the training that he had as a young man () made him such a good engineer.A hasB laterC thatD which我选B.因为这是强调句型,如果不强调：The training he had as a young man made him such a good engineer已经是一个完整的句子了,所以,不应该用连词that或which来引导.为什么?我忽然明白了，应该选C that这个C才是和前面的it was组成强调句型。前面的that引导的是定语从句。另外，我前面的那个问题：it was high time that 后面动词应该怎么用？用什么时态？
• take it for granted这个短语怎么用,用在什么位置.给出几个例子(最好出现在句子中的不同位置)
• not until 的时态问题Don't get off the bus until it __(stop)该填什么时态,为什么请针对每种不同的情况举个例子并解释清楚一下,如果说主句用一般过去式从句就该用过去完成时的话那为什么会有这样的句子The boy didn't go to bed until his mother came back如果说not until的时态要视具体情况的话那么怎么样的情况呢？请具体说明哈谢谢了
• that在这个句子中的作用Experts say Kim Jong-Um is in the process of consolidating power and that he's generating a crsis to whip his people up into a wartime patriotic frenzy ,so that they will rally around the leader while he eliminates his rivals.背景：专家说：金胖正处于巩固权力的阶段,他制造危机使得人民陷入战争时期的爱国*,这样人民就会在他消灭政敌时拥护他.加粗that在这个宾语从句中是什么地位?为什么不省略,突然出现使得句型非常突兀?
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