题干
— _______ we clean the classroom at once?
— No, you _______. You _______ clean it after school.
— No, you _______. You _______ clean it after school.
A：Must; needn’t; may
B：Must; mustn’t; can.
C：Shall; can’t; must
D：Need; mustn’t; may
答案(点此获取答案解析）
A
值是 （ ）
