Why is there no article before "camarero" here when there was in "¡Tú fuiste un médico muy importante!" ? (Omitting the latter "un" was marked wrong.)
Although English requires an "a/an" before one's occupation, Spanish doesn't.
The article is used, however, if the occupation is modified (like very important doctor).
very frustrating, I was going to say a waiter but I got dinged before for putting in an a where there wasn't an un