The teacher must ______ carefully in class. A. listen B. be listened C. be listened to D. be listening
A.A
B.B
C.C
D.D
正确答案是C
The teacher must ______ carefully in class. A. listen B. be listened C. be listened to D. be listening
A.A
B.B
C.C
D.D
正确答案是C