I must go to school this afternoon.(改为同义句)

题目

I must go to school this afternoon.(改为同义句)
I ＿ ＿ ＿go to school this afternoon.
一楼你真强啊,哪有i do 这样说的

答案

I do have to go to school this afternoon.
对补充：
有!
I do have to go to -- 我必须去.不是I 和 do连在一起,是do have to连在一起.你理解错了?
不过如果你没有学过就别用.