Can I tell Peter about the news?-- No I don’t want anyone else to know it. You keep

问题补充：

-- Can I tell Peter about the news?

-- No, I don’t want anyone else to know it. You keep it to yourself.

A. must

B. need

C. can

D. may

答案：

(答案→)A. must

B. need

C. can

D. may

解析：考查情态动词的用法。情态动词可以表示允许。Must“必须”；need“需要”；can“可以”；may“可以”。“我能把这个消息告诉皮特吗？”“不，我不想让其他任何人知道它。你必须保密。”根据答语可知，语气比较强，应该用must。故选A。