_________ did the students realize that they were mistaken about spiders.
A．It was until thenB．It was not until then
C．Not until thenD．Not until when
C
考查倒裝結(jié)構(gòu)。Not 否定詞，否定詞放句首，句子要倒裝。后面本來應(yīng)該是 the students did realize that.....，現(xiàn)在變成了 did the students realize that倒裝了。選C。
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