Question

23页50.the】 book was so interesting that he had read it for three hours ----he realized it

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

Answer 1

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。