Контрольные задания

Вопрос:

Фото задания: 1. You ... all night. You must be exhausted! A 've studied B are studying C 've been studying

Фото задания

1. You ... all night. You must be exhausted! A 've studied B are studying C 've been studying

1. You 've been studying all night. You must be exhausted!

Ответ: C