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He has been working at his report since 10 o'clock,hasn't he? Разделительный
Has he been working at his report since 10 o'clock? Общий
Who has been working at his report since 10 o'clock? Вопрос к подлежащему
When has he been working at his report ? Особый
What has he been doing? Специальный к сказуемому
Has he been working at his report or essay since 10 o'clock? Альтернативный
What has he been working at? Специальный вопрос к прибавлению