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

問題詳情：

---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 

知識點：情態動詞

題型：選擇題