A.DELETEFROMscoreWHERE课程号='C1'AND学号='20091001'
B.DELETEFROMscoreWHERE课程号='C1'OR学号='20091001'
C.DELETEFORMscoreWHERE课程号='C1'AND学号='20091001'
D.DELETEscoreWHERE课程号='C1'AND学号='20091001'