The question is saying that Elena attended so it is past tense<span> and because it is referring to Elena it will be el/ella/usted conjugation.
Therefore: it is probably </span><span>asistió which means attended.
It could be ha </span>asistido though because ha <span>asistido means has attended but Elena has attended a conference does not sound as good as Elena attended a conference.
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Ayer yo prometí llevar a mi sobrino al cine.
This sentence means - Yesterday, I promised to take my cousin to the cinema.
When it comes to the word ayer (= yesterday), you know immediately that you should use the preterite form of a verb, which in this case is prometer. For first person singular, I, that form is prometí.
Actually, I translated it myself your answer is arcoíris or Rainbows, yw
Answer:
anyyyy girrllll online hereeeere m soo bored