Learn what "who was that" means, when people say it, and how to use it naturally in English.

The speaker is asking who was present and implying concern about privacy or a possible intrusion.
From Camouflage, Episode 53
Someone confronts another person about who was in their room while they were bathing.
Use this only when you need to question someone about an unexpected person being in a private space. It can sound accusatory or tense.
Scenes unlock real expressions as you watch
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