I'm afraid it won't be possible to talk to the boss today because he's away ..... business till Tuesday. (*) off (*) on (*) for (*) to
This is a companion discussion topic for the original entry at https://english.best/questions/4519,im-afraid-it-wont-be-possible-to-talk-to-the-boss-today-because-hes-away-___-business-till-tuesday/