a great variety of

It is clear from the passage that, among writers of nonfiction, there is a great variety of aim one of which is the desire to please.

Taken from a nationwide exam in Turkey.

Do you think there is anything wrong with this sentence? I do. A comma is needed after the word "aim" and I have doubts about the use of "one of which" to refer to a singular countable noun "aim". What do you think? Can the expression "a great variety of" be used with singular countable nouns?

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Hello Diamond

Yes, I agree with you. It's not very good at all. I would change it to:

1. It is clear from the passage that, among writers of non-fiction, there is a great variety of aims – one of which is the desire to please.

(Or you might put a comma, semi-colon, or colon instead of the dash.)

I'm sorry to see yet another dodgy exam question.

All the best,

MrP

Thank you, MrP. Thank you very much.