Question

He is adept __swimming .put preposition

Answer 1

He is adept in swimming.
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Answer 2

Now prepositions are those words which tell us about the positions of the object.

There are many prepositions like behind, onto, into, in, on, under and etc.

In this, question the object is relating to swimming.

Adept means well trained.

So the correct answer here would be "in".

This will be the answer.