Ce sont ses idées ___ nous avons longuement discuté.

Answer and explanation

Correct answer: C. dont

  1. Step 1: 'Discuter de' needs 'de', so the relative pronoun must contain it. Step 2. 'Dont' is correct. Answer: dont. Why not the others: 'que' would make 'idées' a direct object, 'qui' a subject and 'où' a place.

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