"Il a perdu les devoirs que ses élèves ont rendus !"
Translation:He lost the homework that his students turned in!
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This is because there is a COD (compliment d'objet direct) in the sentence. Here, the COD is "les devoirs". To find out what the COD is, if there is one, for this sentence you would ask "ses eleves ont rendu quoi ?" "Les devoirs", which is a plural noun. However, in a sentence like ''Mon amie m'a dit quelque chose" you would ask "mon amie a dit A qui ?" (my friend said TO who?) because of this a, or to, there is no agreement. this is only true when a COD is in front of the verb.