23页50.the】 book was so interesting that he had read it for three hours ----he realized itA,when B.uintil C.before 选B可以吗,不可以请说明理由,应选什么,为什么

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23页50.the】 book was so interesting that he had read it for three hours ----he realized itA,when B.uintil C.before 选B可以吗,不可以请说明理由,应选什么,为什么
23页50.the】 book was so interesting that he had read it for three hours ----he realized it
A,when B.uintil C.before 选B可以吗,不可以请说明理由,应选什么,为什么

23页50.the】 book was so interesting that he had read it for three hours ----he realized itA,when B.uintil C.before 选B可以吗,不可以请说明理由,应选什么,为什么
选C.一般常用not...until句型,前面通常有否定.before在这里有“不知不觉,才”的意思.