De or het importsubstitutie?

The correct Dutch article is:

de importsubstitutie

Rule Words ending in -tie and -sie: almost always de. See the rule

How to use importsubstitutie

the importsubstitutiede importsubstitutie
this importsubstitutiedeze importsubstitutie
that importsubstitutiedie importsubstitutie
our importsubstitutieonze importsubstitutie
your importsubstitutiejouw importsubstitutie
every importsubstitutieelke importsubstitutie
which importsubstitutie?welke importsubstitutie?
a big importsubstitutie / the big importsubstitutieeen grote importsubstitutie, de grote importsubstitutie