De or het receptionist-telefonist?

The correct Dutch article is:

de receptionist-telefonist

Rule Words ending in -ist: almost always de. See the rule

How to use receptionist-telefonist

the receptionist-telefonistde receptionist-telefonist
this receptionist-telefonistdeze receptionist-telefonist
that receptionist-telefonistdie receptionist-telefonist
our receptionist-telefonistonze receptionist-telefonist
your receptionist-telefonistjouw receptionist-telefonist
every receptionist-telefonistelke receptionist-telefonist
which receptionist-telefonist?welke receptionist-telefonist?
a big receptionist-telefonist / the big receptionist-telefonisteen grote receptionist-telefonist, de grote receptionist-telefonist