34页60.The book was so interesting that he had read it for three hours -------he realized A.when B.until C.after D.before 为什么

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34页60.Thebookwassointerestingthathehadreaditforthreehours-------herealizedA.whenB.untilC.afterD.befo

34页60.The book was so interesting that he had read it for three hours -------he realized A.when B.until C.after D.before 为什么
34页60.The book was so interesting that he had read it for three hours -------he realized
A.when B.until C.after D.before 为什么

34页60.The book was so interesting that he had read it for three hours -------he realized A.when B.until C.after D.before 为什么
选D,我不是很明白,when一般表示一种伴随状态,after跟时间吧,untill嘛,一般是要怎么样之后才能怎么样的时候用,我学的也不好,