What are the methods of conclusion we have learned in this unit？

What are the methods of conclusion we have learned in this unit？
A.End with a summary and final thought.
B.End with a prediction or recommendation.
C.Include a thought-provoking quotation.
D.End with a question.
正确答案：End with a summary and final thought.End with a prediction or recommendation.Include a thought-provoking quotation.