have been taken .i can't find the recorder in the room,it must____英语解答

have been taken .
i can't find the recorder in the room,it must_____(take) by someone else.
分析；答案have been taken.
过去被动.问题是有个have,我知道有一种形式是加have的,但我记不起来了.大家提醒下.

人气：397 ℃　时间：2020-02-06 02:14:17

解答

have 是完成时要求的；由于是被拿走,因此还要加be动词,就是been