The car ran into a crowd of middle school students, ________ to hospital immediately．
A.two of whom sentB.two of them sentC.two of whom are sentD.two of them sending在线课程B
考查定语从句与状语的区别。A项的语态不对，C项的时态不对。受伤的学生是被送往医院，故选B而不选D作状语。