关于大全使用时遇到的疑问

在word中，按下“显示编辑标记”按钮后，在“D”项后显示出答案的选项，同时在题干的横线上显示出某一选项的内容，但我发现，在横线上显示出的内容往往并不是正确选项的内容，而是其他选项的内容，这是怎么回事呢？

如286

1.       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（B）

(E) the victims unless inoculated