题目内容：

The man seen by us yesterday is Professor Smith. 句型转换

优质解答

The man who we saw yesterday is Professor Smith.

追问：

The man ______ _______ _________ _______yesterday is Proferssor Smith

追答：

who we have seenThe man who we have seen yesterday is Proferssor Smith 我们昨天看到过的那个人就是史密斯教授。