Even today, a century after Pasteur developed the first vaccine, rabies almost always kills （its victims unless inoculated） in the earliest stages of the disease. (A) its victims unless inoculated (B) its victims unless they are inoculated (C) its victims unless inoculation is done (D) the victims unless there is an inoculation (E) the victims unless inoculated 答案是B，错选了E。感觉逻辑好混乱，不知道B的its和they指代什么，麻烦老师讲解。