When do you use duquel,

When do you use duquel, lequel, and auquel? And other variations of those?For instance, what would this be and why? Nous
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Remplissez les tirets avec la bonne forme de "lequel" If my answers are correct.1) C'est un travail a propos(de) duquel nous ne
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What's the difference between Subjonctif and Indicatif?I know that Subjonctif is an emotion or desire? Is Indicatif the rest of
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