that which, the one
Demonstrativpronomen, das auf eine nachfolgende näher beschriebene Sache oder Person hinweist.
Demonstrative pronoun used to point to an object that is subsequently described by a relative clause.
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Dasjenige, was er sagte, war wahr.— That which he said was true.
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Ich wählte dasjenige Buch, das am spannendsten war.— I chose the one book that was the most exciting.