Fill in the blank below with the appropriate relative pronoun.J'ai besoin de savoir se passe.

The correct sentence is “J'ai besoin de savoir ce qui se passe” (“I need to know what is happening”). Use “ce qui” when the relative pronoun is the subject of the verb; here, “what” is the thing that is happening. “Ce que” is used when the pronoun is the object of a verb, so it does not fit here.

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