title: 一道定语从句的题，标题要长。。。。。。。。。。。。。。。Shei 
desc: She is one of the few rsons_______French in our school.
  A.who speaks
  B.who know
  C.which speak
  D.that speaks
  
  答案是B  
  但我想不通，这题先行词不是被few修饰吗？应该用that引导的呀，为什么是B呢？
answer: 这是一个who引导的定语从句，who know French in our school修饰限制the few persons.