题目：4．I __________my teacher carefully，but l __________nothing．
A． listened，listened
B． heard，listened to
C．listened to，heard
D． listened to，listened
喵查答案：C
题目：4．I __________my teacher carefully，but l __________nothing．
A． listened，listened
B． heard，listened to
C．listened to，heard
D． listened to，listened
喵查答案：C
