对划线部分提问：1、They must sweep the floor today 2、he had to take his brother to the doctor‘s
问题描述：
对划线部分提问：1、They must sweep the floor today 2、he had to take his brother to the doctor‘s
1、today划线
2、the doctor‘s划线
答
when must they sweep the floor?
where did he have to take his brother to?2、_____________he_____to take his brother。where ， did ， have