wouldn't you know (it)used to say that something is not at all surprising 难道你不知道〔表示一点也不奇怪〕 I was told in no uncertain terms that Helen, wouldn’t you know it, didn’t approve. 别人肯定地告诉我说海伦不赞成,难道你不知道?
wouldn’t you know (it)• "He showed up late again." "Wouldn't you know it."
→ wouldn’t you know (it) at know1(SPOKEN SECT)