4. The tourists --- a loud noise as soon as they --- into the temple. a. were hearing – stepped; b. were hearing – were stepping; c. heard – were stepping; d. heard – stepped

Перевод задания: Выберите правильные варианты.

d. heard – stepped. The tourists heard a loud noise as soon as they stepped into the temple. (Туристы услышали громкий шум, как только вошли в храм.)

Глагол hear обычно обозначает восприятие, а не длительное действие; оба события выражены Past Simple.