A、SELECT学号,姓名FROM student s WHERE NOT EXISTS (SELECT*FROM score se WHERE SC.学号=s.学号码AND成绩<85) from="" student="" s="" where="" not="" exists="" score="" sc="">=85)
B、C.SELECT学号,姓名FROM student s,score sc WHERE s.学号=sc.学号AND成绩>=85
C、D.SELECT学号,姓名FROM student s,score sc WHERE S.学号=sc.学号AND ALL成绩>=85