Question

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

Answer 1

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.