Q:

Why does this test question use "to Verb-ing"?

The question: 

She is attending the seminar with a view to _______ more qualifications.   
A. acquire
  B. having acquired
  C. acquiring
  D. being acquired

And the answer is C. I don't understand because we uasually use to {infinitive} or just {V}-ing. Is this answer wrong or it is other grammar?

A:

The answer is not wrong. The expression with a view to doing something, in terms of its structure, requires the use of the "ing" form of a verb (that's just how it works). The to here is not an infinitive marker. It's the preposition to which in this case has the meaning of approaching or reaching a particular condition. That's why the correct answer is C (acquiring):

She is attending the seminar with a view to acquiring more qualifications.

