She was so interested in the book that she (read)______it for three hours before

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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

解析本题考查过去完成时。此处空格表示动作发生在before引导的时间状语从句中realized的动作之前，所以应该用动词的过去完成式。

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