Что надо вставить в предложение he ... Shout or else she can't hear him. Have to, has to, don't/doesn't have to, didn't

Тема: Что надо вставить в предложение he ... Shout or else she can\'t hear him. Have to, has to, don\'t/doesn\'t have to, didn\'t have to, had to or won\'t have to.

Правильный ответ будет has to: He has to shout or else she can\'t hear him. Have to точно не подходит, потому что he это 3е лицо единственное число.