问题

________ we clean the classroom at once—No, you________. You ________clean itafter school
A:Must, needn’t, can
B:Need, mustn’t ,may
C:Must, mustn’t, can
D:Shall, can’t , may
B:Need, mustn’t ,may
C:Must, mustn’t, can
D:Shall, can’t , may
正确答案是: