Question

May I come in? No, you ___ . A.mayn't B.mustn't

C.can't
小学英语单项选择

Answer 1

本题不严谨。答案可以是B，也可以是C。
以may开头的问句作肯定回答时一般用：of course,sure,certainly或者Yes,please.
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

Answer 2

mustn't(口语：can't) 表示“禁止,不许”

Answer 3

C