Question

he was too preoccupied __________ his studies to think of other matters.​

Answer 1

Answer:

by

Explanation:

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Answer 2

Answer:

with

Explanation:

Although preoccupied can use preposition like about, by and with. With is the mostly used preposition with word  preoccupied.

He was too preoccupied with his studies to think of other matters.​

Preoccupied means being busy or absorbed in one's work.

Some of the synonyms of preoccupied are  engrossed, intent, pensive