有关英语的问题So fast does light travel that it is difficult for us

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有关英语的问题
So fast does light travel that it is difficult for us to imagine its speed.请问这是个什么句子?does在这里是什么意思?能给个其它例子吗?
It was the training which he had as a young man that made him such a good engineer.请问which和that在里面充当什么成分.怎么理解呢?
It was yesterday that I met you right here.这是个强调句吗?

1.第一个句子是 so .that 引导的结果状语从句,把so 放句首句子用了部分倒装,所以句中出现了does .可以改写为 Light travels so fast that .
eg .So fast does he run that none of us can catch up with him
2.第二句是个强调句,其中的which 是关系代词,引导定语从句,修饰先行词training ,在从句中作had 的宾语.that 是强调 that .
3.第三句是强调句,强调时间状语.

so fast _______ that it is difficult for us to imagine its s ＿＿it is for us to see that he does his work so well! he has __ that it is difficult for him to travel 现要!It is fast to travel by light rail.(fast划线提问) It is dangerous to travel too fast.的英语翻,其中travel it is difficult a book for us This exercise is so difficult that few of us can do it.为什么后面 this question is so difficult that none of us can answer it The teacher told us light ___ fast than sound.(travel) I think that it is _____ problem for us.a quiet difficult b 英语试卷216.The maths problem is so difficult that of us can wor 英语根据首字母填空The problem is so difficult that ( f ） of us can wo