(单选题)
The book was so interesting that he had read it for four hours ______ he realized it.
A.while
B.after
C.before
D.as soon as
参考答案：C
参考解析：
考查连词辨析。句意：这本书太有趣了，他不知不觉就读了四个小时。while意为“当……时候”；after意为“在……之后”；before意为“在……之前”；as soon as意为“一……就”。此处realize是指意识到“读了四个小时”这件事，根据题干中read和realize的时态顺序可确定正确答案。故选C。
知识点：
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