What are the writing essentials of the Problem-solution Pattern mentioned in the video? A.The solution to the problems do not equals to the causes of the problems. B.Use some conjunctions. C.The solutions should echo the problems.

What are the writing essentials of the Problem-solution Pattern mentioned in the video? A.The solution to the problems do not equals to the causes of the problems. B.Use some conjunctions. C.The solutions should echo the problems.

正确答案：ABC