查询所修课程成绩都大于等于85分的学生的和姓名,正确的命令是( )。 A.SELECT,姓名FROM student s WHERE NOT EXISTS (SELECT*FROM score se WHERE SC.=s.码AND成绩<85) from="" student="" s="" where="" not="" exists="" score="" sc="">=85) C.SELECT,姓名FROM student s,score sc WHERE s.=sc.AND成绩>=85 D.SELECT,姓名FROM student s,score sc WHERE S.=sc.AND ALL成绩>=85