The book was so interesting that he had read it for three hours____he realized it.(before/until)

The book was so interesting that he had read it for three hours____he realized it.(before/until)
好像正确答案是before ,.....
英语人气:163 ℃时间:2019-08-18 17:03:55
优质解答
应该是before,我以前做过,也错过,所以印象深刻
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