--- Mum, could I play with my classmates for a while after I finish my homework?
--- _______. But you must come back before supper.
A. Yes, you can B. Yes, you could
C. No, you can't D. No, you couldn't
A
【解析】本题答语的含义是晚饭前你必须回家,根据答句的含义应该是对问句的肯定,could构成的的一般疑问句,回答是不在拥有委婉礼貌的语气,不在用could,而应该用can,故本题选A。