The sunspot came into its active stage, ____ that happens once every eleven years.
A. one B. it C. the one D. what
请朋友们详细地解答下，比如选：C，为什么前面要加：the......
谢谢了

我选D，

指代这个active stage 吧

The sunspot came into its active stage, ____ that happens once every eleven years.
A. one B. it C. the one D. what
这个题目很有问题哦，不管是哪个选项都不能跟that搭配。
The sunspot came into its active stage,which happens once every eleven years.可能还比较正确。
which引导的从句是非限制性定语从句，说明前面发生的情况是每十一年一次。

1.这个句子看上去很像定语从句，但它只是一个one作为替代词的用法问题。
2.one/ones 可代替一个名词性词组。例句：
If you want to buy an electric heater, you may be interested in this one in the window.
i wish I'd bought a few jars of honey. Did you notice the ones they were selling by the roadside?
He goes about interviewing retired sailors who served in the pre--1914 navy. The one that he met in Devon last week was a fascinating storyteller.
第一句one 代替electric heater。第二句ones代替jars of honey。第三句The one 代替retired sailors who served in the pre--1914 navy。
3.用the表示上文中已提到过的人或事物。
He told me a srory. The story was wery interesting.
4.三楼的用法完全正确，只是这是一道题。非限制性定语从句有时在形式上是从句，实质上其功用相当于一个分句。例句：
Then he met Mary, who invited him to a party.(who=and she)

C .it是代指同名同物，what不可引导非限定从，可排除。one是泛指，the one是特指。

这题选A，上边解释了那么多，怎么还瞎给答案呢？

it, what接个that无法理解，直接排除

one代替的是前面一句话所陈述的事实（也不是啥定语从句，ok不？！），那是自然现象，你特指不特指它还是会发生，自然没有the。

The sunspot came into its active stage, ____ that happens once every eleven years.
A. one B. it C. the one D. what
其实很简单。the one 是its active stage 的同位语，that从句是the one的定语从句。理解为中文是：也就是每十一年出现一次的那个阶段。因为这里active stage为不可替代性故选答案c:the one.
本人认为该解释很合理也很清楚。

八楼说the one 是its active stage 的同位语。我认为不对。
1.同位语的概念：当两个指同一事物的句子成分放在同等位置时，一个句子成分可被用来说明或解释另一个句子成分，前者就叫做后者的同位语。
2.用代词做同位语的例句：
She herself said so.
they all wanted to see him.
they both look beautiful.
let's you and me go to work, Oliver.
其中herself、all 、 both、you and me 是同位语。
由此可见，the one 不是its active stage 的同位语。

choose C? is that right?I think first you can't choose B or D,because they can't 引导非限定性定语
从句,maybe somebody will saye "what"可以,但它是复合关系代词,此处不缺先行词,故也排除.
Why i choose C instead of A?because i think this sentence 绝对是指代前面整句话,有特指之意.So i choose C!
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Welcome!!!!

选A。 one指代前面的整句话。

选C。B、D直接排除。这里用the one,特指前面说的现象。

选A吧。语感

选择A选项 在这里ONE只带一类事物 就是sunspot 大又不是仅仅指代这一次的所以用one

都TMD飞舞 不会解释就说题目问题忽悠观众

The sunspot came into its active stage, ____ that happens once every eleven years.
A. one B. it C. the one D. what
请朋友们详细地解答下，比如选：C，为什么前面要加：the......


应该选A one 在这里是代词 替代 its active stage, 泛指一个活跃期,所以不用加the. one 在这里作 stage 的同位语,同时one 也是先行词，后面 that 引导的是定语从句.
此题目的意思 是 太阳黑子进入活跃期,每11年就会发生一次.

The sunspot came into its active stage, ____ that happens once every eleven years.
A. one B. it C. the one D. what

这题肯定是A，one指代“its active stage”。由于是泛指，不能加the(太阳黑子活跃期一直发生的，这里没有特指某一次）。