at the party I found Tina seated alone in the front row.A. ArrivingB. To arriveC. Arrive

问题补充：

at the party, I found Tina seated alone in the front row.

A. Arriving

B. To arrive

C. Arrive

D. Arrived

答案：

(答案→)A. Arriving

B. To arrive

C. Arrive

D. Arrived

解析：

试题分析:考查非谓语用法。由结构分析可知，句中没有连词，所以逗号前是状语，故排除C选项。主句主语I 和前面动词arrive 之间是主动关系，所以用现在分词表示主动，正确答案是A。句意：一到聚会上，我就发现蒂娜独自坐在前排。