---I can't stop smoking ,doctor.----For your heath,I am afraid you_____A may B need C have to D musD 是must说明为什么选这个答案

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---I can't stop smoking ,doctor.----For your heath,I am afraid you_____A may B need C have to D mus
D 是must
说明为什么选这个答案

D 表示必要性 ,加强语气

must

c