---Can I tell my best friend about it? ---No. I don’t want anyone else to know. You let i

问题补充：

---Can I tell my best friend about it?

---No. I don’t want anyone else to know. You let it out.

A. mustn’t

B. won’t

C. don’t have to

D. don’t need to

答案：

(答案→)A. mustn’t

B. won’t

C. don’t have to

D. don’t need to

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