A. SELECT 学号,姓名,性别 FROM S WHERE EXISTS (SELECT * FROM SC WHERE SC.学号=s.学号 AND 成绩<=85) B.SELECT 学号,姓名,性别 FROM S WHERE NOT EXISTS (SELECT * FROM SC WHERE SC.学号=s.学号 AND 成绩<=85) C.SELECT 学号,姓名,性别 FROM S WHERE EXISTS (SELECT * FROM SC WHERE SC.学号=S.学号 AND 成绩>85) D.SELECT 学号,姓名,性别 FROM S WHERE NOT EXISTS (SELECT * FROM SC WHERE SC.学号=S.学号 AND 成绩<85)