Some people are never ashamed_____their wrongdoings. The appropriate preposition for the gap is-

The sentence is about people who do wrong things and never feel ashamed. In the blank space, we need to put a preposition that fits best with the sentence. The correct preposition is 'of', but why? We use the preposition 'of' after ashamed to indicate the person or thing that is causing the feeling of shame. In this sentence, the people are ashamed of their wrongdoings. Therefore, the correct preposition in the blank space is 'of'.