______ did the students realize that they were mistaken about spiders.A.It was until thenB.It was not until thenC.Not until thenD.Not until when
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C解析考查倒装结构。Not 否定词，否定词放句首，句子要倒装。后面本来应该是 the students did realize that.....，现在变成了 did the students realize that倒装了。选C。