A: Must I drink ten glasses of water every day?
B: No, you _______.
However, drink a lot of water every day is good for your health.
A) Don't must B) don't need C) don't have to D) must not
答案是 C ；可是我想知道 B為什麼不對?
有沒有人可以提供 這三個 must / have to / need 比較詳盡的用法?
謝謝!
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