Hi andi1,
There are multiple ways to go about answering CR questions. Some people like to prephrase answers. This strategy is sometimes built on the assumption that without prephrasing, a person won't pay attention to or keep straight the details of the passages in CR questions. If you can keep the details of the passages straight, there is no need for prephrasing, and it can hurt more than it helps, as it takes time, can be distracting, and may tempt you to choose an incorrect answer because it sounds like your prephrased answer.
The foundation of correctly answering CR questions is completely understanding the passages and noticing any key details contained in the passages. If you can do that consistently without prephrasing, then there is no need to prephrase.
Feel free to reach out with further questions.
Good luck!