You ring the bell because I have a key. A. must B. mayn’t C. needn’t D. mustn’t
You ______ ring the bell because I have a key.
A. must
B. mayn’t
C. needn’t
D. mustn’t
You ______ ring the bell because I have a key.
A. must
B. mayn’t
C. needn’t
D. mustn’t
Đáp án C