I wish I'd known about that rule earlier 其中'd是哪个单词?如题,would?had?

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IwishI''dknownaboutthatruleearlier其中''d是哪个单词?如题,would?had?IwishI''dknownaboutthatruleearlier其中''d是哪个单词?如

I wish I'd known about that rule earlier 其中'd是哪个单词?如题,would?had?
I wish I'd known about that rule earlier 其中'd是哪个单词?
如题,would?had?

I wish I'd known about that rule earlier 其中'd是哪个单词?如题,would?had?
had 注意known是过去分词.

had