Final answer:
Flashbacks are necessary in stories with in media res openings to provide background information and engage the reader.
Step-by-step explanation:
Flashbacks are often necessary in stories with in media res openings because these stories naturally make the reader wonder what happened earlier. By introducing a flashback, the author can provide necessary background information and context to engage the reader and enhance their understanding of the story. For example, in a story that begins with an action-packed scene, a flashback can reveal the events that led up to that moment, adding more depth and intrigue to the narrative.
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