题目内容：

Generally speaking,____ we have seen seems more believable than ____ we have been told.
A.what; that B.what; what C.that; what D.that; that
选什么,

优质解答

we have seen seems...是我们看到过的东西看起来更可信的意思,那这里缺少一个主语指代我们看到过的东西吧
后面那句也一样,we have been told意思是我们被告知的,也是缺少一个主语
所以都用what