I regret ____(have)to do this,but I have no choice.

I regret ____(have)to do this,but I have no choice.
I regret ____(have)to do this,but I have no choice.

I regret ____(have)to do this,but I have no choice.
to have,regret doing sth是后悔做某事,regret to do sth是遗憾做某事,题中说我别无选择显然是指我很遗憾,但并不后悔