She was so interested in the book that she (read) ______ it for three hours befo

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问题 She was so interested in the book that she (read) ______ it for three hours before she realized it.

选项

答案 had read

解析此处空格表示动作发生在before引导的从句中realized的动作之前，所以应该用其过去完成时。

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