He had to repent . . . . . . . . what he had done. A. of B. over C. at D. for

The correct answer is: for.

To repent means to feel or express regret or remorse for one’s wrongdoings. In this case, the man had to feel regret for what he had done. The preposition “for” is used to express regret or remorse for something that one has done.

The other options are not correct because they do not express regret or remorse.

• The preposition “of” is used to express possession or ownership. For example, “I am the owner of this car.”
• The preposition “over” is used to express a position above or on top of something. For example, “The bird flew over the tree.”
• The preposition “at” is used to express a position or location. For example, “The man is at the store.”

I hope this helps!