De or het taakinvulling?

The correct Dutch article is:

de taakinvulling

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

How to use taakinvulling

the taakinvullingde taakinvulling
this taakinvullingdeze taakinvulling
that taakinvullingdie taakinvulling
our taakinvullingonze taakinvulling
your taakinvullingjouw taakinvulling
every taakinvullingelke taakinvulling
which taakinvulling?welke taakinvulling?
a big taakinvulling / the big taakinvullingeen grote taakinvulling, de grote taakinvulling