who is the student's best critic

问题描述:

who is the student's best critic
为什么不是who is the student't the best critic?
不是说*一定要加the吗

the 前面已经加过了啊.. 在student's 前面.
换个方法的话是 who is the best critic of students?
名词词组的话是 the + AdjP (形容词词组)+ 主名词