会议一结束，这个人就被要求辨认四张图片中哪一张被使用过。

Once the session was over, this person was asked to identify which of the four images had been used.

youdao

会议一结束，这个人就被要求辨认四张图片中哪一张被使用过。

Once the session was over, this person was asked to identify which of the four images had been used.

youdao