求英语高手解答一道对比题（答好加分）

求英语高手解答一道对比题（答好加分）
①The man stopped____whether he was being followed.
A.as to find B as if to find
②The man we followed suddenly stopped and looked as if___whether he was going in the right direction.
A.to see B.seeing
①选A ②选A
这两题有区别么,为什么第一题不选B?再者也只见过so as to表目的,有as to表目的