Question

Most students like the teachers        understand them well.

A．which

B．who

C．where

D．when

Answer 1

B

which先行词指物；who先行词指人；where 先行词表示地点；when先行词表示时间。句意：大部分学生喜欢很了解他们的老师。本句中先行词the teachers为下文定语从句的逻辑主语，指人，故引导词用who，选B。