Mary ____ on the essay for two hours now and she hopes that she ~ it in one more hour.Đoạn văn61/65Mary ____ on the essay for two hours now and she hopes that she ~ it in one more hour.is working - can finishhas been working - will finishwill have worked - finisheshad been working - would finishGiải thíchĐáp án đúng là b.