The man we followed suddenly stopped ad looked as if whether he was going I the right dir

问题补充：

The man we followed suddenly stopped ad looked as if whether he was going I the right direction.

A. seeing

B. having seen

C. to have see

D. to see

答案：

A. seeing

B. having seen

C. to have see

(答案→)D. to see

解析：as if 引导的状语从句是一个省略句，只剩下了目的状语to see。