A.SELECT学号,姓名 FROM student s WHERE NOT EXISTS<br> (SELECT*FROM score sc WHERE sc.学号=s.学号 AND 成绩<85)
B.SELECT学号,姓名 FROM student s WHERE NOT EXISTS<br> (SELECT*FROM score sc WHERE sc.学号=s.学号 AND 成绩>=85)
C.SELECT学号,姓名 FROM student s,score sc<br> WHERE s.学号=sc.学号 AND 成绩>=85
D.SELECT学号,姓名 FROM student s,score sc<br> WHERE s.学号=sc.学号 AND ALL 成绩>=85