did you read this one too?
https://www.urch.com/forums/faqs/3978-gm ... bakes.html

basically, according to Erin,
one of the NOUN + that/who +PLURAL VERB

Went back to my notes, and it seems the key is to look for the definite article "the". The modifying clause should modify the definite subject/object.

case 1:
One of the students who have scored high is very smart. <--- "who have scored high" modifies "the students" (plural) Meaning is that out of the students who have scored high, one of them is very smart

case 2:
The one of the students who has scored high is very smart. <--- "who has scored high" modifies "the one" and specifically that one (singular). Meaning is that This particular one, who, out of all students, has scored high, is very smart.

In case 1, "one" is indefinite, so "who have/has" modifies "the students" group which is the only definite entity in the sentence; in case 2, "the one" is definite, and "who have/has" goes on to modify and further explain what it is about this specific "one".

Uptowngirl,

The links you have posted are not proper. Would you please edit the links properly.

In the mean time try to remember these set of rules.
And if you find anything any question that doesn't fit in these rules please post the links to them as well.

I was trying to find the actual post of RON . But I couldn't. However Try to remember these rules. I will post the link once i find it.

One of the Xs that/who <plural>
One of the Xs <singular>
only One of the Xs <singular>
only One of the Xs that/who <plural>
THE only One of the Xs that/who <singular>

Here is the link.just read this and nothing more to avoid confusions. You will not have any doubts. Atleast I never had doubts after this.

https://www.beatthegmat.com/one-of-the-t40356.html

re-linked:)

Thanks for the link hemanth!!MUCH clearer:)