听力原文:M: Ordinarily you never seem to be nervous. But why were you so nervous just now
W: You know, I didn't enter my house until I found my key at 11 o'clock last night, so I didn't have enough time to preview my lessons.
Q: Why did the woman feel nervous?
(13)
A.She was afraid of the professor.
B.She lost her key and couldn't enter her house.
C.She didn't make full preparations for her lessons.
D.She was blamed by the professor for her carelessness.