Question

【题目】The book was so interesting that he read it for four hours _______ he realized it.

A. while B. after C. before D. as soon as

Answer 1

【答案】C

【解析】

试题分析：句意：这本书如此有趣以至于他在意识到前读了四个小时。A. While当……时候；B. After在……之后；C. before 在……之前；D. as soon as一……就。根据句意及语境此题应选C。