Question

--may i come home late today? --no. you___.we will have a party a,couldn't b, mustn't

我怎么感觉选择b呢，答案是第一个

Answer 1

答案：B
解释：
1、这里考察的是情态动词may的用法。
2、以may开头的问句作肯定回答时一般用：of course，sure，certainly或者Yes, please.
3、而否定回答一般用can't或者mustn't，mustn't的语气比can't更加强烈，但是不能用couldn't。比如：
May I come in?
Yes, please. /Of course...
May I smoke here?
Yes, you may. /Yes, please.
May I put things here?
No, you can't/mustn't.

Answer 2

mustn't语气太强烈。

Answer 3

mustn't 表示必须不，很强烈的语气，应用于回答非法或高危险活动，比如说- can i play football in the street ? - no , you mustn't . 希望对你有帮助