這道題是08北京高考的29題,橫線應(yīng)該是have been.現(xiàn)在完成時還可以表示未來發(fā)生的動作,例如：
I will wait until he has written his letter.我愿意等到他把信寫完.
我再給你兩道真題
（08山東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
第一道是有比較明顯的完成時時間狀語 by the time,但從意義上看也是現(xiàn)在完成時表示將來； 第二道也是用現(xiàn)在時表示將來.
答案分別 C B