Раскройте скобки, поставив нужную форму глагола (Present Continuous, Past Continuous, Future Continuous, Present Perfect, Past Perfect, Future Perfect, Present Perfect Continuous):
- By that time next year he (to work)
- will have been working
- will have worked
К сожалению, у нас пока нет статистики ответов на данный вопрос,
но мы работаем над этим.