Can my boss give my position to another worker?

Question Details: After 3 months of starting work, I got promoted to become the temporary cook. I was to fill the position until the permanent cook returned. Now, a year, later I have earned enough hours to apply for the permanent position, which I have done. The other day my manager told me that he wanted to train someone else for that position to "see who was the best person for the job". As a result I had to take my initial position which reduced my hours and pay. Can he legally do that because I am only a temporary worker?

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