Hide Trust Domain On Logon combo user

Good morning .
In advance thank you for your attention.
Step expose. Recently it has established a relationship of trust between two domains. One the main call them A (default) and one for the development department B has been established as a company they are parallel mostly external.

When do not we realized that now in the user logon two domains appear in the combo logon.

I can create an adm template to hide the combo box domain and users have to log in with user @ domainA,however do you know how to hide the trust domain of the combo or else to force that the domain A  is always the possibility of being modified by the user?.
Disculpen si mi ingles no es muy correcto.
Nuevamente ,gracias por su tiempo

Thank you very much to all
Best regards
fallenfallsAsked:
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