—Can you keep a secret?
—You ________ worry—I'm not going to mention it to anyone.
A．needn'tB．couldn't
C．mustn'tD．won't
A
答案：A　考查情態(tài)動(dòng)詞。句意為：你能幫我保守秘密嗎？你不必?fù)?dān)心，我不會(huì)向任何人提及的。needn't不必要；couldn't不能夠；mustn't禁止；won't將不會(huì)。根據(jù)句意可知，答案A符合語(yǔ)境。
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