______ was not until the early 20th century _____ the importance of his ideas was realized.A.What; thatB.It; thatC.That; soD.It ;when
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B解析试题分析：考查强调句的特殊句型：It was not until….that….，直到…才…，句意：直到20世纪初，他思想的重要性才被意识到。选B。考点：考查强调句的特殊句型
点评：强调句型在高考中每年必出，关键是要会判断，平时练习时要有这个意识。it is /was+被强调部分+that/who+…判断方法是去掉it is /was that/who句子不缺成分，即为强调句型。It was not until….that….，直到…才…，这是特殊的强调句，记住结构和含义。