－Let'sgototheconcerttonight,Mary.
－Sorry,I____.Ihavetohelpmymomwiththehousework.
A: needn't
B: can't
C: mustn't
D: shouldn't
－Sorry,I____.Ihavetohelpmymomwiththehousework.
A: needn't
B: can't
C: mustn't
D: shouldn't
举一反三
- Mary _______ be at home. I saw her in the library just now. A: mustn’t B: needn’t C: shouldn’t D: can’t
- —MustIfinishmyhomeworknow?<br/>—No,you______.Youcangohomenow. A: needn’t B: mustn’t C: shouldn’t D: can’t
- —Can you answer that question —Sorry, I ______. A: mustn’t B: needn’t C: C. can’t
- Must I hand in all my money, Mum? A: mustn't B: can't C: needn't D: shouldn't
- Must I hand in the paper right now No, you ______ A: mustn't B: needn't C: can't D: shouldn't