Can I say 对知识难以抑制的渴望 How do you add 'I have an' to it? (我有)对知识难以抑制的渴望？
Can I say 对知识难以抑制的渴望 How do you add 'I have an' to it? I have an unquenchable thirst for knowledge. (我有) 对知识难以抑制的渴望？对知识(我有)难以抑制的渴望 (我)对知识 (有)难以抑制的渴望I Lol I dont know maybe you would use something else all together! Would I need to use a counter like 个

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I think maybe 我对知识有一种难以抑制的渴望 is the best one. The counter 个 is not suitable here, 一种is a better counter.
hope my answer can help you~

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you can say 我对知识有 一种 难以抑制的渴望。
you also can say 我对知识如饥似渴。
“如饥似渴”is an idiom, an ancient chinese remark.

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你用的三种说法都可以。
最自然的说法是“我对知识有（一种）难以抑制的渴望I ”
另外两种说法属于倒装句，也可以用。
加上“一种”感觉更好一点。

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My suggestion is 我对知识如饥似渴.

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对知识难以抑制的渴望      无人称
(我有)对知识难以抑制的渴望      是第1人称
其他的句子没有区别
长时间的绕口令对身体不好^.^