在职申硕英语考试

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

网考网参考答案：B
网考网解析：
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。 查看试题解析出处>>