English Tenses Обзор видовременных форм на основе текста DRILLING FOR OIL – PAST AND PRESENT
Поставьте глаголы в скобках в нужную видовременную форму и залог.
Long ago, wells (1) were dug (dig) in the ground using percussion drilling. A heavy wooden cutting tool (2) was suspended by a rope from a pulley on a wooden tripod. The tool (3) ...