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.
问题描述：
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.
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