Usually we use 'who' to refer to persons, however, 'that' is also acceptable. com for its explanations. Here is a clip from "that": —Usage note 4 .
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TuongvanCan I give examples like this?:Yes. That's the kind of thing your book is referring to.
We will accept all who / that graduated from this school.
It is I who/that will be interviewed by my boss.