Question

I eaten lunch at three o'clock every day. Указать время​

Answer 1

Если есть маркер every day, то это Present Simple. Правильно будет

I have lunch at 3 o'clock every day.

Со словами завтрак, обед, ужин используется только have

Answer 2

Based on the sentence you provided, the time mentioned is "three o'clock." The person eats lunch at three o'clock every day.