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【单选题】
查询有选课记录，但没有考试成绩的学生的学号和课程号，正确的sQL语句是（ ）。A.
SELECT学号，课程号FROM SC WHERE 成绩
B.
SELECT学号，课程号FROM SC WHERE 成绩 =NULL
C.
SELECT学号，课程号FROM SC WHERE成绩ls NULL
D.
SELECT学号课程号FROM SC WHERE成绩
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