____（seat）at the back of the lecture hall,

题目

____（seat）at the back of the lecture hall,
he listened to the professor carefully.
正确答案是Seated,为什么不是Seating?主语不是人吗,不应该用主动式吗?

答案

seat 用作动词,是 使...坐下
所以 he 显然是 被（使坐下）,当然要被动