The man we followed suddenly stopped and looked as if whether he was going in the right di

问题补充：

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

A. seeing

B. having seen

C. to see

D. to have seen

答案：

A. seeing

B. having seen

(答案→)C. to see

D. to have seen

解析：as if to see=as if he were(was) to see，as if引导的表语从句或者方式状语从句可以采用这种省略形式。