do可以做助动词,不用怀疑,因为疑问句都是助动词或情态动词开头.至于后一句的have to 和do的地位相同,一般回答都是I do 但这里把do指代的内容直接表达出来了,这样也是可以的.（have to 也是省略结构,后面还可以加上具体的事.）
英语大神进.（Do ）you have to stay at home today?Yes,I （have to）.为什
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