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

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：考察情态动词。A必须B需要C能够D也许

根据句意“不想让其他任何人知道”，所以语气应该是最强烈的“必须”，故选A