题目内容
The book was so interesting that he had read it for three hours he realized it.
A. before B. after C. until D. since
A 【解析】句意:这本书是如此的有趣以至于他意识到的时候已经读了三个小时了。before在…之前;after在…之后;until直到…时候;since自从。he had read it 是过去完成时态,空后realized是一般过去时态,主句的动作先发生,从句的动作后发生,再根据句意可知应选A。
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