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 题目和参考答案——青夏教育精英家教网—

题目内容

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

解析试题分析：考查定语从句和强调句型。第一空when the first vitamin was identified修饰先行词1911年；第二空that与it was构成强调句型。句意：直到第一种维他命被识别住的1911年，人们才意识到维他命的重要性。故B正确。
考点：考查定语从句和强调句型
点评：短语从句的关键是分析句子成分，强调句型要确定被强调的成分是什么。

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