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must 反意疑问句的用法

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must 反意疑问句的用法
he must be curious about everything,for it is the first time that he has been here,____?
a.isn't he
b.isn't it
答案是选b,我怀疑是不是答案错了?
答案是正确的,因为此处提出的反意疑问是对它前面一句而提出的.for it is the first time that he has been here的主语是it,故答案选择isn't it