I think A is correct, by experience.
A. I need more of her advice.
B. I need more her advice.(Sounds weird)
And C is correct, rather than D, by experience again.
C. You can get more advice there
D. You can get more of advice there. (Obviously wrong)
However, I am unable to explain why we need "of" after more sometimes but not always. Anyone could explain?
kenny1999 I am unable to explain why we need "of" after more sometimes but not always. Anyone could explain? Can anyone/someone explain?
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kenny1999I am unable to explain why we need "of" after more sometimes but not always.Anyone could explain?Can anyone/someone explain?
You need 'of' after a quantifying determiner (many, some, enough, etc.) when you already have a referring determiner (the, this, his, her, etc.). Otherwise, don'