我早该知道他不会理解。

I should have known that he wouldn't understand.

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I should have known that he wouldn't understand.

known 是动词 know 的过去分词形式。know 的意思是"知道、了解",这里用在 should have known 结构中表示"本应该知道(但实际不知道)"的后悔或责备语气。

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