From Nutting exercise 50:
We shall soon meet the hunter who lives in the woods…He often sits there in the shade to kill the wolves which come from the caves…Once he was able thus to catch a little bear, which he brought into the town.
In the translation key “who lives” is translated as Venatorem, qui in silvas habitat;
“to kill the wolves which come from the caves” is Saepe in umbra sedet ut lupos occidat, qui e speluncis veniunt;
“a little bear, which he brought into the town” is ursam ita capere potuit, quam in oppidum duxit.
I realize the relative pronoun agrees with its antecdent in number and gender, but gets its case from its role in the clause its in. I don’t understand why in the first two cases the relative pronoun is in the nominative, while in the last case it’s in the accusative. I would have thought all three cases would be in the accusative since they all are referring to the direct object of the verb.