英语语法疑惑One of the most popular adventure stories _______writt

英语语法疑惑
One of the most popular adventure stories _______written is Robert Louis Stephenson's Treasured Island,an exciting story about a young boy,Jim Hawkins,
who is captured by pirates and later finds some buried treasure.
A,ever B,already C,once D,never
这里填什么好?
尤其是这个AC有何区别?不是都是表示曾经?
written做后置定语?

One of the most popular adventure stories _______written is Robert Louis Stephenson's Treasured Island, an exciting story about a young boy, Jim Hawkins,
who is captured by pirates and later finds some buried treasure.
A, ever B, already C, once D, never
这里填什么好?
尤其是这个AC有何区别? 不是都是表示曾经?
written做后置定语?
答：A
析：此题不会是高考题,题句太长.不合出题原则.
不管它,我将它简化：One of the stories (ever/ once) written is sb's XXX.
XXX是书名.正规的书上用斜体表示（知道没办法）增加理解难度.
主句就是A is B.
是的, ever/ once written是过去分词短语作后置定语,修饰the stories的.
ever这个词,很难用汉语说清楚.不同的情况下,有不同的翻译.而once相对简单,就是“曾经”.用定语从句来思考：=the ... stories which were ever written Vs the ... stories which were once written
还真难说清楚.
待续.查词典去了.
再问： 这是一篇完形填空的其中这个空格我不会故节选，网上有很多这样的原文。 为什么要填ever？
再答： 哦刚才要下班，忘记这个题了。说查词典，还没查呢。 ever:[nonassertive] at any time, Nothing ever makes him angry. Do you ever go to concerts? No, never. Have you ever been to Paris? 所以：the adventure stories ever written= the ... stories which were written at any time. once: adv. some time ago; formerly: He once knew her, but they are no longer friends. No one remembers that once-popular singer. 你要学会用英英词典。一比较，就知道，这里用ever比once好。不是说once用在这里有语法错，也不是说意思不通。有一个最佳选择的问题。原文用的就是最佳选词。ever=at any time历史上任何时期所写的冒险小说，比起：once =some time ago 几年前人们所写的那些冒险小说，是不是更好呢？ 知道“推敲”一词的来历吗？ 在一定的上下文中，用“推”好，还是“敲”好，确实值得推敲。