The knowledge point of this topic is the prosecution procedure of civil litigation. The contents of the complaint submitted by the parties in item A are correct. Article 122 of the new civil procedure law stipulates that if a civil dispute brought by a party to the court is suitable for mediation, it should be mediated first, unless the party refuses to mediate. So item b is correct. After the withdrawal of the lawsuit, the parties may file another lawsuit on the same claim, and the people's court shall accept it, so item C is correct. Article l23 of the new People's Procedure Law stipulates that the people's court shall guarantee the right of prosecution enjoyed by the parties according to law. Lawsuits that conform to Article 1 19 of this Law must be accepted. Those who meet the conditions for prosecution shall file a case within seven days and notify the parties concerned; If it does not meet the conditions for prosecution, it shall make a ruling within seven days and refuse to accept it; If the plaintiff refuses to accept the ruling, he can appeal. Therefore, if item D is wrong, a ruling should be made. So, the correct answer is ABC.