问题: 选择题
The book was sointeresting that he had read it for three hours___he realized it.
A.when B.until C.after D.before
答案是D，我不会区分BD的区别，若用B，句子是怎样的？
解答:
The book was so interesting that he had read it for three hours__D__he realized it.
A.when
B.until
C.after
D.before
原因是he had read it for three hours是过去完成时态.
若用B，句子是：
The book was so interesting that he didn't realize it until he had read it for three hours.
不过还是有些别扭
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