Question

The story was so interesting that she had read it for three hours ___ she realized it.

The story was so interesting that she had read it for three hours ___ she realized it.
A.when B.before C.after D.until
这道题的答案是选B，为什么不选A呢？

Answer 1

The story was so interesting that she had read it for three hours ___ she realized it.
A.when B.before C.after D.until
选B
1看意思
A的解释是当...，用于发生在同时的是
before解释为在...之前
全句意思为在我认识带着本书是一本有趣的书之前，我看了三个小时
2看时态，如果是when的话，前面就应该和后面时态对应，其那面也应该用过去时she read it for three hours
而before的时态要往前推一格的
所以只能选B
有不会的可以再问我

Answer 2

是因为时态吧
前面是过去时 所以应该是before