I was (so interested in) the video that I (watched) it (for) two hours before I (realized) it.

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问题 I was (so interested in) the video that I (watched) it (for) two hours before I (realized) it.

选项 A、so interested
B、watched
C、for
D、realized

答案B

解析 改为had watched。因为realized是动词过去式,而watch(the video)发生在 realized之前,所以用过去完成时。
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