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1 . 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
2016-11-26更新 | 893次组卷 | 2卷引用:2015届福建莆田市第二十四中学高三上第二次月考英语试卷
共计 平均难度:一般