Question

---Must I leave now?

---No, you ______.

1. A.
   mustn't
2. B.
   needn't
3. C.
   don't
4. D.
   won't

Answer 1

B
考查情态动词。句意为：----我必须现在离开吗？----不，你不必。当“不必”讲应该是needn't，mustn't表示“不可以”；won't表示“不会”。needn't经常作为must的否定回答。