2

私は帰国することに決めた

This is the original sentence, but shouldn't it be:

私は帰国することを決めた

or

私は帰国することが決めた?

-1

ことに決める{きめる} is a structure that means, by itself "to decide". You'd use を with the verb 決める{きめる} if you refer to choosing a noun.

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