听力原文:W: Is Sam a full-time student?M: I don't know he became a full-time student until
听力原文:W: Is Sam a full-time student?
M: I don't know he became a full-time student until last semester.
Q: What does the man mean?
(17)
A.Sam is probably a part-time student.
B.Sam doesn't go to all his classes.
C.He doesn't remember it Sam is a student or not.
D.He thinks Sam is a full-time student now.