大全一题

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

这题选B 费解..........

thanks I will take your advice