那个自称是医生的骗子其实根本没有医学学位。

The man claiming to be a doctor was actually an ___impostor with no medical degree.

尽管获得了晋升，他仍然觉得自己是个冒牌货，担心会被发现不够格。

Despite getting promoted, he still feels like an ___impostor, afraid of being exposed as unqualified.