think his daugther must be a student改为反问疑问句 答案 isn't she 为什么啊!1请教英语高手!!

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think his daugther must be a student改为反问疑问句 答案 isn't she 为什么啊!1
请教英语高手!!

因为这句话的主要实际动词是be动词,所以答案是isn't.

must be 表推测是反意疑问句要用be的相应形式