preguntasteis
Preguntasteis is the second-person plural preterite indicative form of the Spanish verb preguntar, which means "to ask." This form is used when addressing a group of people (you all) and referring to an action of asking that was completed in the past.
For example, if someone asked a group of people "Did you all ask the teacher for help?",
Therefore, "preguntasteis" is specific to the grammatical context of Spain and indicates a past, completed action