Sir,we seem ____ your phone number,Could you write it down for us again?

题目

Sir,we seem ____ your phone number,Could you write it down for us again?
为什么用to have lost而不用to lost

答案

to have lost表示已经遗失
to lost 表示将要遗失
当然是已经遗失了才会请求人家再写一遍