Помогите с заданием, спам=жалоба
The problem ... for three years, but they haven’t got any results.
is studied
has been studied
was studied
has being studied
The problem ... for three years, but they haven’t got any results.
is studied
has been studied
was studied
has being studied
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Ответ:
The problem has been studied for three years, but they haven’t got any results. — Проблема изучается три года, но пока результаты не получены.
Объяснение:
Используется время present perfect continuous, т. к. действие началось в прошлом и продолжается до текущего момента.