Final answer:
The correct form to fill in the blank in the passé composé with the verb 'descendre' in the sentence is 'est descendue.'
Explanation:
In the sentence Mme Broussard du taxi devant l'hôtel. (descendre), the correct form to fill in the blank in the passé composé would be est descendue. The verb descendre needs to agree with the subject Mme Broussard in gender and number, so the correct conjugation is est descendue.
Learn more about French grammar and verb conjugation here:
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