De or het theologiebeoefening?

The correct Dutch article is:

de theologiebeoefening

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

How to use theologiebeoefening

the theologiebeoefeningde theologiebeoefening
this theologiebeoefeningdeze theologiebeoefening
that theologiebeoefeningdie theologiebeoefening
our theologiebeoefeningonze theologiebeoefening
your theologiebeoefeningjouw theologiebeoefening
every theologiebeoefeningelke theologiebeoefening
which theologiebeoefening?welke theologiebeoefening?
a big theologiebeoefening / the big theologiebeoefeningeen grote theologiebeoefening, de grote theologiebeoefening