—Must I finish the exercise this afternoon?—Yes you but you finish it now.A. must mus

问题补充：

—Must I finish the exercise this afternoon?

—Yes, you , but you finish it now.

A. must, mustn’t

B. must , don’t have to

C. may, needn’t

D. may , mustn’t

答案：

A. must, mustn’t

(答案→)B. must , don’t have to

C. may, needn’t

D. may , mustn’t

解析：考查情景交际。“我今天下午必须完成练习吗？”“是的，你必须，但是你现在不比。”用must提问，肯定回答还用must，否定回答用needn’t或don’t have to。mustn’t“禁止”，否定回答不用mustn’t，排除A。故选B。