单项选择题

案例分析题

M I found that file you were looking for.
W You found the Whitman file？I searched my entire office yesterday for it.I was so worried.I couldn’t sleep all night thinking about it.Where was it？
M It was next to the copier on the third floor.I guess you left it there.
W I completely forgot.I went there to make copies because the copier on our floor isn’t working.Thank you so much，I feel so relieved.Mr.Adams was asking me about it this morning，and I didn’t know what to say.

What are the speakers mainly discussing?（）