--- Who told you my address ? --- I don’
题型：选择题
问题：
--- Who told you my address ? --- I don’t remember clearly. It _____ Li Mei.
---It _____ Li Mei. She doesn’t know it.
A．can be; mustn’t be
B．may have been;must have been
C．may have been; can’t be
D．must have been ; can’t have been