单选题：检索选修课程“C2”的学生中成绩最高的学生的学号。正确的SELECT语句是：

检索选修课程“C2”的学生中成绩最高的学生的学号。正确的SELECT语句是：



A.
SELECT S# FORM SC
WHERE C#=“C2” AND GRADE＞＝
(SELECT GRADE FORM SC WHERE C#=“C2”)


B.
SELECT S# FORM SC
WHERE C#=“C2” AND GRADE IN
(SELECT GRADE FORM SC WHERE C#=“C2”)


C.
SELECT S# FORM SC
WHERE C#=“C2” AND GRADE NOT IN
(SELECT GRADE FORM SC WHERE C#=“C2”)

D.
SELECT S# FORM SC
WHERE C#=“C2” AND GRADE＞＝ALL
(SELECT GRADE FORM SC WHERE C#=“C2”)



答案：D