Final answer:
The subject of this question is Spanish and the grade level is Middle School. The correct verb in the imperfect tense to complete the sentence is 'querían'.
Step-by-step explanation:
In this question, the subject is Elena y tú, which means 'Elena and you'. The correct verb in the imperfect tense to complete the sentence would be 'querían'.
Learn more about Imperfect tense in Spanish verbs