The correct answer should "I am happy, and they are, too." The first missing common is tolerable but not the second. Small beer perhaps, but still....................
Thank you for your comment! It is tue that it is better with a comma. A comma has been added after 'happy': "I am happy, and they are too". A comma has also been added to sentences in English from the kwiz of a similar structure.
I hope this is helpful. Merci de votre contribution !
Bonne journée !
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