Help! "Mă aflu la serviciu" is given as an alternative answer. Isn't "aflu" a form of the verb "a afla" (to come to know)? How can "Mă aflu la serviciu" mean "I am at work"?
"a se afla" (reflexive) can also mean "to be", the non-copulative version:
to be somewhere - a se afla undeva
to be beautiful - can't use "a se afla"
Thank you again!