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【单选题】
检索还未确定成绩的学生选课信息，正确的SQL命令是（ ）。
A.
SELECT学生．，姓名，选课．课程号FROM学生JOIN选课 WHERE学生．学=选课．AND选课．成绩IS NULL
B.
SELECT学生．，姓名，选课．课程号FROM学生JOIN选课 WHERE学生．=选课．AND选课．成绩=NULL
C.
SELECT学生．，姓名，选课．课程号FROM学生JOIN选课 ON学生．=选课．WHERE选课．成绩IS NULL
D.
SELECT学生．，姓名，选课．课程号FROM学生JOIN选课 ON学生．=选课．WHERE选课．成绩=NULL
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