Most students like the teachers understand them well.
A. which B. who C. where D. when
Most students like the teachers understand them well.
A. which B. who C. where D. when
B
【解析】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。
考点：定语从句