单选题
I was (so interested in) the video that I (watched) it (for) two hours before I (realized) it.
A、
so interested in
B、
watched
C、
for
D、
realized
【正确答案】
B
【答案解析】
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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