问题描述：
He really must go now_________?反义疑问句
He really must go now__________?
A.must he
B.doesn't he
C.mustn't he
D.must he
答案给的是A,可是为什么不是B或C呢?
He really must go now__________?
A.must he
B.doesn't he
C.mustn't he
D.must he
答案给的是A,可是为什么不是B或C呢?
问题解答：
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