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Help the host complete her diary entry about a disastrous dinner party.
When the guests finally _________________________ at 8 PM, I realized with horror that my dog _________________________ the entire roast beef.
When the guests finally arrived at 8 PM, I realized with horror that my dog had eaten the entire roast beef.
We use the past simple (arrived) for the event that happened at a specific time in the past (8 PM).
We use the past perfect (had eaten) for the action that happened before that specific time in the past. The dog's sneaky snack happened before the guests arrived!