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定于从句中引导词只可以用which和只可以用that还有两者都可以用的情况?

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定于从句中引导词只可以用which和只可以用that还有两者都可以用的情况?
定于从句中引导词只可以用which和只可以用that还有两者都可以用的情况?
根据非限制性定语从句只能由B.如果改成句号,就可用that,用来指前边整个句子.
在下面几种情况下必须用“that”引导定语从句:
1.当先行词前有一个最高级形容词所修饰时.如:
This is one of the most exciting football games that I have ever seen.这是我所看过的足球赛中最激烈的一场.
2.当先行词前有一个序数词所修饰时.如:
The first thing that you could do was to turn off the light.你首先要做的就是熄灭灯.
3.先行词为 all 、 everything 、 nothing 、 something 、 anything 、 little 、 much 、 none 等不定代词时( something 后也可用 which ).如:
All that we have to do for our students is to tell them how to speak English in class.我们为学生所要做的事情就是告诉他们如何在课上说英语.
I'm going to buy everything that I need.我要去买我所需要的一切东西.
4.当先行词前面有 only 、 all 、 any 、 no 等词修饰时.如:
The only thing that he could do was to run away.他唯一要做的就是逃跑.
There are no people that things must not happen to.不碰到事故的人是没有的.
5.当先行词既有人又有物时:
They talked of things and persons that they remembered in the school.