It was not until 1911, _______ the first vitamin was identified, _______ people realized the importance of it．
A．when; whichB．when; thatC．that; whichD．that; that
B
考查定語從句和強(qiáng)調(diào)句型。定語從句When the first vitamin was identified修飾先行詞1911,因?yàn)榫渥雍芡暾褂藐P(guān)系副詞when.第二空與it was構(gòu)成強(qiáng)調(diào)句型。句意：正是知道第一批維他命被識別出來的1911年，人們才意識到它的重要性。故B正確。
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