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> It was not until 1911, _______ the first vitamin was identified, _______ people realized the importance of it． A．when; which B．when; that C．that; which D．that; that

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发布时间：2024-09-08

It was not until 1911, _ the first vitamin was identified, _ people realized the importance of it．

A．when; which B．when; that C．that; which D．that; that

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