听力原文:M: I got my grades in the mail and there was a mistake in my mark for your course
W: I know there was a problem with the computer system. It should be straightened out by next week.
Q: What does the woman mean?
(14)
A.The man is mistaken.
B.The error will be corrected.
C.She didn't know about the problem.
D.Grades were sent late.