When I turned to the person next to me I recognized that he was my schoolmate.A. seating

问题补充：

When I turned to the person next to me, I recognized that he was my schoolmate.

A. seating

B. being sat

C. sit

D. seated

答案：

A. seating

B. being sat

C. sit

(答案→)D. seated

解析：考查非谓语动词。句中seated作定语，修饰名词the person，过去分词表示状态。句意：当我转向坐在我旁边的那个人时，我认出他是我的同学。