Answer:
Khai k tha have been making
It is a strange experience, and it confuses him.
in order to be strange it imply that the narrator have not felt this feeling before. furthermore, the feeling of confuse emphasises that it is a new experience for the narrator to the point the narrator is not able to identify the hunger.
Sometimes prepositional phrases aren't really necessary, especially when you use them instead of an apostrophe + s to denote possession of an object.
