23. You look tired! Yes, I ___ (do) sports since morning. a) do; b) am doing; c) have been doing; d) have done

Перевод задания: Выберите правильный вариант.

c) have been doing: You look tired! Yes, I have been doing sports since morning. The present perfect continuous emphasizes an activity continuing over a period of time.

Перевод: Ты выглядишь уставшим! Да, я занимаюсь спортом с утра. Present Perfect Continuous подчёркивает действие, продолжающееся в течение некоторого времени.