I was in complete ignorance of his intentions.

我完全不知道他的意图.

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I am embarrassed by my complete ignorance of history.

我对历史一无所知，这让我很难堪。

辞典例句

The boy's parents felt very angry, because they were in complete ignorance of his intentions.

男孩的父母很生气, 因为他们完全不知道他的意图.

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