---Mum,       Iplayfootballthisafternoon?---Sure,butyou...

问题详情：

---Mum,        I play football this afternoon?

---Sure, but you       finish your homework first.

A. may; could B. can; must         C. can; mustn’t     D. may; can’t

【回答】

 B 

知识点：情态动词

题型：选择题