Final answer:
The correct form of the verb in the question 'Qu'est-ce que vous ... Madame?' is 'choisissez.' Modern French communication often uses question particles like 'est-ce que'.
Explanation:
Qu'est-ce que vous choisissez Madame?
In this question, the correct form of the verb to complete it is 'choisissez' as it matches with the subject 'vous' which is the formal 'you' in French.
When forming questions in French, using a question particle like 'est-ce que' or question intonation is more common in modern French communication.
Learn more about French verbs and question formation here:
https://brainly.com/question/42704909
