—Mom I play computer games?—Yes you can. But you have to finish your homework first. A.

问题补充：

—Mom, I play computer games?

—Yes, you can. But you have to finish your homework first.

A. must

B. may

C. will

D. need

答案：

A. must

(答案→)B. may

C. will

D. need

解析：句意：妈妈，我可以玩电脑游戏吗？可以。但你必须先完成你的家庭作业。Must必须；may可以；will将；need需要。征求对方许可常用May开头的疑问句，所以选B。