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 ,.....

问题描述:

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 ,.....

The book was so interesting that he had read it for three hours_until___he realized it.

until

应该是before,我以前做过,也错过,所以印象深刻