—Why are you so depressed? —I my MP4 player on the bus.A. had lostB. am lostC. have lostD

问题补充：

—Why are you so depressed?

—I my MP4 player on the bus.

A. had lost

B. am lost

C. have lost

D. was lost

答案：

A. had lost

B. am lost

(答案→)C. have lost

D. was lost

解析：考察时态。根据题意，你为什么这么沮丧？——我在公交车上丢了我的MP4。可知下文叙述的事情到现在为止已经发生，故用现在完成时态。选C。