I beg your pardon? 或者直接说pardon, 都是因为没听清,要求对方再说一遍的意思。前者相对比较婉转。
口语中也可以直接说sorry? 注意音调往上走,同样是希望对方重复说一遍。
至于repeat,要客气的话,可以说 Would you mind repeating that?
如果要用repeat就是 How dare you repeat that !
【 dare的语气比较强硬】
【另】You dare to say that again!
I dare you say that again!
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pardon