they were reparing their watches at that moment
Еhey have repaired their watches --- "в данный момент" для Present Perfeect неприменимо
It was that moment when they understood that their watches had been repaired by their friends.
Объяснение:
в данный момент неприменимо во всех случаях, т.е. маркеры этих времен не такие. Поэтому, была сделана замена на that moment (в тот момент) в первом и третьем случаях, а во втором этого делать вообще нельзя.
