这道题是08北京高考的29题,横线应该是have been.现在完成时还可以表示未来发生的动作,例如：
I will wait until he has written his letter.我愿意等到他把信写完.
我再给你两道真题
（08山东25）By the time he realizes he ______into a trap,it’ll be too late for him to do anything about it.
A.walks B.walked C.has walked D.had walked
（06北京27）—______ leave at the end of this mouth.
—I don`t think you should do that until ______ another job.
A I`m going to; you`d found B I`m going to; you`ve` found
C I`ll; you`ll find D I`ll; you`d` find
第一道是有比较明显的完成时时间状语 by the time,但从意义上看也是现在完成时表示将来； 第二道也是用现在时表示将来.
答案分别 C B