She was so interested in the book that she______it for three hours before she realized it.

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问题 She was so interested in the book that she______it for three hours before she realized it.

选项 A、read
B、would have read
C、was reading
D、had read

答案D

解析后面的for three hours before she realized it提示要用过去完成时态，表示在过去某一时刻之前动作已经完成。

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