You tell anybody else about it; this is a secret between us.A. don’tB. needn’tC. mustn’tD

问题补充：

You tell anybody else about it; this is a secret between us.

A. don’t

B. needn’t

C. mustn’t

D. won’t

答案：

A. don’t

B. needn’t

(答案→)C. mustn’t

D. won’t

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