Question

I was so interested in the video that I______ it for two hours before I realized it. (2 分)

I was so interested in the video that I______ it for two hours before I realized it. (2 分)
A. watched
B. had watched
C. was watching
D. shall have watched

Answer 1

B

动作发生了一个时间段的时候一般是用完成时态

have done sth + for(since等）+时间

表示在这个时间段里完成了某个事情

如：I have been in USA since 1996.

由于这里整个时态是过去时，所以后面也要用过去完成时

Answer 2

B

Answer 3

B