Question

7. —Can those        (seat) at the back of the classroom hear me?

—No problem.

Answer 1

7. seated此处seat为及物动词，常与反身代词连用或用be seated的形式。这里seat与those构成逻辑上的被动关系，故用其过去分词作定语，those seated at the...是those who are seated —的省略。