Question

it is ten o' clock ________ my watch​

Answer 1

Answer:

it is ten o'clock in my watch.

Answer 2

Explanation:

By' is a preposition that expresses proximity(by the riverside), means(come by train), action with a purpose( passed by working hard), a person's action in passive voice( done by him). 'It is ten o'clock by my watch' expresses that according to my watch, the time is ten o'clock.