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

B

【解析】

試題分析：考查連詞搭配。前半句為非限制性定語從句，先行詞為1911表示時(shí)間且，應(yīng)是在1911年，故應(yīng)用when，第二空考查強(qiáng)調(diào)句it is not until….that…直到…才…，句意：直到1911年，第一個維他命被發(fā)現(xiàn)，人們才意識到它的重要性。故選B

考點(diǎn)：考查連詞搭配

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